{"id":318,"date":"2010-04-05T13:03:16","date_gmt":"2010-04-05T13:03:16","guid":{"rendered":""},"modified":"2010-04-05T13:03:16","modified_gmt":"2010-04-05T13:03:16","slug":"318","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=318","title":{"rendered":"\u52a0\u901f\uff0c\u52a0\u901f\uff0c\u518d\u52a0\u901f\uff1a\u6765\u81eaGoogle\u7684\u7f51\u7ad9\u52a0\u901f\u6280\u5de7\u5927\u5168"},"content":{"rendered":"

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< h1>One< \/h1> < h2>Two< \/h2> < h3>Three< \/h3> < h4>Four< \/h4> < h5>Five< \/h5> \u6211\u4eec\u5c06\u6807\u9898\u6807\u7b7e\u66ff\u6362\u6210div\u6807\u7b7e\uff0c\u6e90\u4ee3\u7801\u5927\u5c0f\u589e\u52a0\u4e8610\u5b57\u8282\uff0c\u53d8\u6210\u4e8679\u5b57\u8282\uff0c\u4f46\u7ecf\u8fc7\u538b\u7f29\u540e\u53ea\u670966\u5b57\u8282\u3002<\/p>\n

< div>One< \/div> < div>Two< \/div> < div>Three< \/div> < div>Four< \/div> < div>Five< \/div> HTTP\u7f13\u5b58<\/p>\n

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\u5173\u95edExpires<\/p>\n

\u5f00\u542fExpires<\/p>\n

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\u4e3a\u4e86\u66f4\u6e05\u6670\u5730\u770b\u5230\u8fd9\u4e2a\u5b8c\u6574\u8fc7\u7a0b\uff0c\u53ef\u4ee5\u4f7f\u7528HttpWatch\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u67e5\u770bhttp\u62a5\u5934\u3002\u5982\u679c\u4f7f\u7528Apache\u7684\u8bdd\uff0c\u53ef\u4ee5\u53c2\u8003mod_expires\u6a21\u5757\u7684\u8d44\u6599\u3002<\/p>\n

\u4f7f\u7528Page Speed\u63d0\u5347\u7f51\u7ad9\u6027\u80fd<\/strong><\/p>\n

Page Speed\u662f\u7531Google\u53d1\u5e03\u4e86\u4e00\u6b3e\u5f00\u6e90Firefox \u63d2\u4ef6\uff0c\u5b83\u53ef\u4ee5\u8bc4\u4f30Web\u9875\u9762\u7684\u6027\u80fd\u95ee\u9898\uff0c\u5e76\u80fd\u591f\u7ed9\u51fa\u5408\u7406\u7684\u4f18\u5316\u5efa\u8bae\uff0c\u540c\u65f6\u5b83\u4e5f\u53ef\u4ee5\u5c06\u8d44\u6e90\u53d8\u5f97\u66f4\u5c0f\u3002<\/p>\n

\u25c6\u56fe\u7247\u538b\u7f29<\/p>\n

\u56fe\u7247\u6587\u4ef6\u4e2d\u901a\u5e38\u90fd\u5305\u542b\u4e86\u4e00\u4e9b\u989d\u5916\u7684\u4fe1\u606f\uff0c\u5982JPEG\u56fe\u7247\u5305\u62ec\u521b\u5efa\u56fe\u7247\u6240\u7528\u5de5\u5177\u7684\u4fe1\u606f\uff0cPNG\u56fe\u7247\u901a\u8fc7\u521b\u65b0\u7f16\u7801\u53ef\u4ee5\u7f29\u5c0f\u6587\u4ef6\u5927\u5c0f\uff0c\u8fd9\u4e9b\u8f6c\u6362\u90fd\u662f\u65e0\u635f\u7684\uff0c\u538b\u7f29\u540e\u7684\u56fe\u7247\u548c\u672a\u538b\u7f29\u7684\u56fe\u7247\u770b\u8d77\u90fd\u662f\u4e00\u6837\u7684\uff0c\u4f46\u5360\u7528\u7684\u5b57\u8282\u6570\u5374\u5c11\u4e86\uff0c<\/p>\n

Page Speed\u4f7f\u7528\u4f18\u5316\u56fe\u50cf\u529f\u80fd\u5c1d\u8bd5\u4e3a\u9875\u9762\u4e2d\u7684\u6240\u6709\u56fe\u7247\u8fdb\u884c\u65e0\u635f\u538b\u7f29\uff0c\u5982\u679c\u6210\u529f\u7684\u8bdd\uff0c\u5c31\u663e\u793a\u538b\u7f29\u540e\u7684\u7248\u672c\uff0c\u4e3a\u4e86\u4f7f\u7528\u56fe\u7247\u7684\u6700\u4f4e\u7248\u672c\uff0c\u5728Page Speed\u9762\u677f\u4e2d\u70b9\u51fb\u94fe\u63a5\u5230\u538b\u7f29\u7248\u672c\uff0c\u4fdd\u5b58\uff0c\u4f7f\u7528\u5b83\u4ee3\u66ff\u539f\u59cb\u56fe\u7247\u3002<\/p>\n

\u25c6\u524a\u51cfJavaScript<\/p>\n

\u79fb\u9664\u5927\u578bJavaScript\u6587\u4ef6\u4e2d\u7684\u6ce8\u91ca\u548c\u7a7a\u683c\u53ef\u4ee5\u5927\u5e45\u5ea6\u51cf\u5c11\u6587\u4ef6\u7684\u5c3a\u5bf8\uff0c\u4f46\u529f\u80fd\u5374\u65e0\u4e1d\u6beb\u635f\u4f24\u3002Page Speed\u63d0\u4f9b\u4e86\u524a\u51cfJavaScript\u7684\u529f\u80fd\uff0c\u524a\u51cf\u6210\u529f\u540ePage Speed\u4f1a\u663e\u793a\u4e00\u4e2a\u5230\u8be5\u6587\u4ef6\u7684\u94fe\u63a5\uff0c\u5982\u679c\u8981\u4f7f\u7528\u524a\u51cf\u540e\u7684\u6587\u4ef6\uff0c\u70b9\u51fb\u90a3\u4e2a\u94fe\u63a5\uff0c\u4fdd\u5b58\u6587\u4ef6\uff0c\u7136\u540e\u5230html\u9875\u9762\u4e2d\u91cd\u65b0\u5f15\u7528\u8fd9\u4e2a\u66f4\u5c0f\u7684JavaScript\u6587\u4ef6\u3002<\/p>\n

\u4f46\u8fd9\u6837\u505a\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u524a\u51cf\u540e\u7684JavaScript\u6587\u4ef6\u7684\u79fb\u52a8\u6027\u5c31\u964d\u4f4e\u4e86\uff0c\u5982\u679c\u4f60\u7ecf\u5e38\u66f4\u65b0\u7684\u8bdd\uff0c\u5efa\u8bae\u4f60\u4f7f\u7528\u53e6\u4e00\u4e2a\u524a\u51cf\u547d\u4ee4\u884c\u5de5\u5177JSMIN\u3002<\/p>\n

\u25c6\u79fb\u9664\u4e0d\u7528\u7684css<\/p>\n

\u79fb\u9664css\u6587\u4ef6\u6ca1\u6709\u4f7f\u7528\u5230\u7684\u89c4\u5219\u5c06\u6709\u52a9\u4e8e\u51cf\u5c11css\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u56e0\u4e3a\u6d4f\u89c8\u5668\u5728\u6d4f\u89c8Web\u9875\u9762\u65f6\u5f80\u5f80\u4f1a\u5c06css\u6587\u4ef6\u4e0b\u8f7d\u5230\u672c\u5730\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u51cf\u5c11\u53d1\u9001\u5230\u6d4f\u89c8\u5668\u7684\u4fe1\u606f\u91cf\uff0c\u4ece\u800c\u52a0\u901f\u9875\u9762\u53cd\u5e94\u901f\u5ea6\uff0c\u4f46\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u6709\u4e9b\u5916\u90e8css\u6587\u4ef6\u662f\u7531\u591a\u4e2aWeb\u9875\u9762\u5f15\u7528\u7684\uff0c\u5728\u79fb\u9664\u65f6\u8981\u7279\u522b\u5c0f\u5fc3\u3002<\/p>\n

Page Speed\u63d0\u4f9b\u4e86\u79fb\u9664\u4e0d\u540c\u7684css\u529f\u80fd\uff0c\u5b83\u53ef\u4ee5\u544a\u8bc9\u4f60\u90a3\u4e9bcss\u89c4\u5219\u662f\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u3002<\/p>\n

\u9664\u4e86\u4e0a\u9762\u63d0\u5230\u7684\u8fd9\u4e09\u4e2a\u529f\u80fd\u5916\uff0cPage Speed\u8fd8\u6709\u66f4\u591a\u7684\u529f\u80fd\u7b49\u5f85\u4f60\u53bb\u53d1\u6398\u3002<\/p>\n

\u51cf\u5c11\u6d4f\u89c8\u5668reflow<\/strong><\/p>\n

Reflow\u662f\u6d4f\u89c8\u5668\u4e3a\u91cd\u65b0\u6e32\u67d3\u6587\u6863\u6216\u6587\u6863\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u91cd\u65b0\u8ba1\u7b97\u6587\u6863\u5143\u7d20\u7684\u4f4d\u7f6e\u548c\u51e0\u4f55\u5927\u5c0f\u7684\u7edf\u79f0\uff0c\u56e0\u4e3areflow\u5728\u6d4f\u89c8\u5668\u4e2d\u662f\u4e00\u4e2a\u7528\u6237\u62e6\u622a\u64cd\u4f5c\uff0c\u8fd9\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u7406\u89e3\u5982\u4f55\u63d0\u5347reflow\u65f6\u95f4\u548c\u4e0d\u540c\u6587\u6863\u5c5e\u6027\uff08DOM\u6df1\u5ea6\u3001css\u89c4\u5219\u6548\u7387\u3001\u4e0d\u540c\u7c7b\u578b\u7684\u6837\u5f0f\u53d8\u5316\uff09\u5bf9reflow\u65f6\u95f4\u7684\u5f71\u54cd\u3002\u6709\u65f6reflow\u4e00\u4e2a\u5143\u7d20\u53ef\u80fd\u9700\u8981reflow\u6587\u6863\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff0c\u4ee5\u53ca\u8ddf\u7740\u5b83\u7684\u6240\u6709\u5143\u7d20\u3002<\/p>\n

\u6709\u5f88\u591a\u4e2d\u7528\u6237\u884c\u4e3a\u548cDHTML\u53d8\u5316\u53ef\u4ee5\u89e6\u53d1reflow\uff0c\u5982\u6539\u53d8\u7a97\u53e3\u5927\u5c0f\u3001\u4f7f\u7528\u5305\u542b\u8ba1\u7b97\u6837\u5f0f\u7684JavaScript\u51fd\u6570\u3001\u4eceDOM\u4e2d\u6dfb\u52a0\u6216\u79fb\u9664\u5143\u7d20\u4ee5\u53ca\u6539\u53d8\u67d0\u4e2a\u5143\u7d20\u7684\u7c7b\u522b\u90fd\u53ef\u4ee5\u89e6\u53d1reflow\uff0c\u503c\u5f97\u6ce8\u610f\u7684\u662f\u6709\u4e9b\u884c\u4e3a\u53ef\u80fd\u5bfc\u81f4reflow\u7684\u65f6\u95f4\u6bd4\u4f60\u60f3\u8c61\u4e2d\u7684\u8981\u591a\u3002\u6765\u770b\u4e00\u5f20\u56fe\u3002<\/p>\n

<\/p>\n

\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\u4e0d\u662fJavaScript\u4e2d\u4efb\u4f55\u6837\u5f0f\u7684\u53d8\u5316\u90fd\u4f1a\u89e6\u53d1reflow\uff0c\u8fd8\u53ef\u4ee5\u770b\u51fa\u6d4f\u89c8\u5668\u7248\u672c\u8d8a\u9ad8reflow\u65f6\u95f4\u66f4\u597d\u4e86\u3002<\/p>\n

\u5728Google\uff0c\u6211\u4eec\u5bf9\u6211\u4eec\u7684\u9875\u9762\u8fdb\u884c\u4e86\u5927\u91cf\u7684\u6d4b\u8bd5\uff0c\u6700\u7ec8\u6211\u4eec\u8ba4\u4e3a\u8981\u5f80\u9875\u9762\u4e2d\u6dfb\u52a0UI\u5143\u7d20\u65f6\u6700\u503c\u5f97\u8003\u8651\u7684\u56e0\u7d20\u5c31\u662freflow\u65f6\u95f4\u4e86\u3002\u4e0b\u9762\u662f\u6211\u4eec\u6574\u7406\u7684\u53ef\u4ee5\u5e2e\u52a9\u51cf\u5c11reflow\u65f6\u95f4\u7684\u65b9\u6cd5\uff1a<\/p>\n

\u25c6\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684DOM\u6df1\u5ea6\uff0c\u5728DOM\u6811\u4e0a\u4efb\u610f\u4e00\u5c42\u53d1\u751f\u7684\u53d8\u5316\u90fd\u4f1a\u5f71\u54cd\u5230DOM\u6811\u7684\u6240\u6709\u5c42\uff0c\u5f53\u7136\u8fd9\u5728reflow\u65f6\u82b1\u7684\u65f6\u95f4\u80af\u5b9a\u6bd4\u8f83\u591a\u4e86\u3002<\/p>\n

\u25c6\u7f29\u5c0fcss\u89c4\u5219\uff0c\u79fb\u9664\u4e0d\u7528\u7684css\u89c4\u5219\u3002<\/p>\n

\u25c6\u5982\u679c\u4f60\u4f7f\u7528\u66f4\u590d\u6742\u7684\u6f14\u793a\u53d8\u5316\uff0c\u5982\u52a8\u753b\uff0c\u90a3\u4e48\u4f60\u6700\u597d\u4f7f\u7528\u7edd\u5bf9\u4f4d\u7f6e\u6216\u5c06\u4f4d\u7f6e\u56fa\u5b9a\u4e0b\u6765\u3002<\/p>\n

\u25c6\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u590d\u6742\u7684css\u9009\u62e9\u5668\uff0c\u7279\u522b\u662f\u884d\u751f\u9009\u62e9\u5668\uff0c\u5b83\u9700\u8981\u66f4\u591a\u7684CPU\u65f6\u95f4\u5904\u7406\u9009\u62e9\u5668\u5339\u914d\u3002<\/p>\n

\u4f18\u5316JavaScript\u4ee3\u7801<\/strong><\/p>\n

\u5ba2\u6237\u7aef\u4ee3\u7801\u53ef\u4ee5\u8ba9\u4f60\u7684\u5e94\u7528\u7a0b\u5e8f\u52a8\u8d77\u6765\u53d8\u5f97\u66f4\u6709\u6d3b\u529b\uff0c\u4f46\u8fd9\u4e9b\u4ee3\u7801\u53ef\u80fd\u4f7f\u6d4f\u89c8\u5668\u53d8\u5f97\u66f4\u4f4e\u6548\uff0c\u4e0d\u540c\u7684\u5ba2\u6237\u7aef\u6027\u80fd\u4e5f\u4e0d\u4e00\u6837\uff0c\u8fd9\u91cc\u6211\u4eec\u8ba8\u8bba\u51e0\u4e2a\u4f18\u5316JavaScript\u7684\u6280\u5de7\u3002<\/p>\n

\u25c6\u5b57\u7b26\u4e32\u7684\u4f7f\u7528<\/p>\n

\u5728IE6\u548cIE7\u4e2d\u56e0\u5b57\u7b26\u4e32\u7ea7\u8054\u5bfc\u81f4\u7684\u4e3b\u8981\u95ee\u9898\u662f\u5783\u573e\u56de\u6536\u6027\u80fd\uff0c\u867d\u7136\u8fd9\u4e9b\u95ee\u9898\u5728IE8\u4e2d\u5df2\u7ecf\u5f97\u5230\u89e3\u51b3\uff0c\u4f46\u5982\u679c\u4f60\u7684\u7528\u6237\u5927\u90e8\u5206\u4ecd\u7136\u5728\u4f7f\u7528IE\u6216IE7\uff0c\u4f60\u5c31\u5f97\u683c\u5916\u6ce8\u610f\u8fd9\u4e2a\u95ee\u9898\u4e86\u3002\u770b\u4e00\u4e2a\u4f8b\u5b50\u5148\uff1a<\/p>\n

var veryLongMessage = ‘This is a long string that due to our strict line length limit of’ + maxCharsPerLine + ‘ characters per line must be wrapped. ‘ + percentWhoDislike + ‘% of engineers dislike this rule. The line length limit is for ‘ + ‘ style purposes, but we don’t want it to have a performance impact.’ + ‘ So the question is how should we do the wrapping?’; <\/p>\n

\u25c6\u4f7f\u7528\u8fde\u63a5\u4ee3\u66ff\u7ea7\u8054\uff1a<\/p>\n

var veryLongMessage = [‘This is a long string that due to our strict line length limit of’, maxCharsPerLine, ‘ characters per line must be wrapped. ‘, percentWhoDislike, ‘% of engineers dislike this rule. The line length limit is for ‘, ‘ style purposes, but we don’t want it to have a performance impact.’, ‘ So the question is how should we do the wrapping?’].join(); \u4e0e\u6b64\u7c7b\u4f3c\uff0c\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\u4f7f\u7528\u7ea7\u522b\u4e5f\u662f\u5f88\u4f4e\u6548\u7684\uff0c\u9519\u8bef\u7684\u505a\u6cd5\uff1a<\/p>\n

var fibonacciStr = ‘First 20 Fibonacci Numbers ‘; for (var i = 0; i <  20; i++) { fibonacciStr += i + ‘ = ‘ + fibonacci(i) + ‘ ‘; } <\/p>\n

\u6b63\u786e\u7684\u65b9\u6cd5\uff1a<\/p>\n

var strBuilder = [‘First 20 fibonacci numbers:’]; for (var i = 0; i <  20; i++) {   strBuilder.push(i, ‘ = ‘, fibonacci(i)); } var fibonacciStr = strBuilder.join(”); <\/p>\n

\u25c6\u5b9a\u4e49\u7c7b\u51fd\u6570<\/p>\n

\u4e0b\u9762\u7684\u51fd\u6570\u662f\u4f4e\u6548\u7684\uff0c\u56e0\u4e3a\u6bcf\u6b21\u6784\u9020baz.Bar\u7684\u5b9e\u4f8b\u65f6\uff0c\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\u548c\u95ed\u5305\uff1a<\/p>\n

baz.Bar = function() {   \/\/ constructor body   this.foo = function() {   \/\/ method body   }; }  \u6b63\u786e\u7684\u65b9\u6cd5\u662f\uff1a<\/p>\n

baz.Bar = function() {   \/\/ constructor body };  baz.Bar.prototype.foo = function() {   \/\/ method body };  \u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u65f6\uff0c\u65e0\u8bbabaz.Bar\u6784\u9020\u4e86\u591a\u5c11\u4e2a\u5b9e\u4f8b\uff0c\u90fd\u53ea\u4f1a\u4e3afoo\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\uff0c\u800c\u4e14\u4e0d\u4f1a\u521b\u5efa\u95ed\u5305\u3002<\/p>\n

\u25c6\u521d\u59cb\u5316\u5b9e\u4f8b\u53d8\u91cf<\/p>\n

\u4f7f\u7528\u5b9e\u4f8b\u53d8\u91cf\u503c\u7c7b\u578b\u521d\u59cb\u503c\u521d\u59cb\u5316\u5b9e\u4f8b\u53d8\u91cf\u58f0\u660e\uff0c\u5982\u6570\u503c\u3001\u5e03\u5c14\u503c\u3001\u7a7a\u503c\u3001\u672a\u5b9a\u4e49\u6216\u5b57\u7b26\u4e32\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u6bcf\u6b21\u8c03\u7528\u6784\u9020\u5668\u65f6\u8fd0\u884c\u4e0d\u5fc5\u8981\u7684\u521d\u59cb\u5316\u4ee3\u7801\u3002\u8fd8\u662f\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n

foo.Bar = function() {   this.prop1_ = 4;   this.prop2_ = true;   this.prop3_ = [];   this.prop4_ = ‘blah’; };  \u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n

foo.Bar = function() {   this.prop3_ = []; };  foo.Bar.prototype.prop1_ = 4;  foo.Bar.prototype.prop2_ = true;  foo.Bar.prototype.prop4_ = ‘blah’;  \u8fdb\u884c\u4ee3\u66ff\u3002<\/p>\n

\u25c6\u907f\u514d\u4f7f\u7528with<\/p>\n

\u907f\u514d\u5728\u4ee3\u7801\u4e2d\u4f7f\u7528with\uff0c\u5b83\u4f1a\u5f71\u54cd\u5230\u6027\u80fd\uff0c\u56e0\u4e3a\u5b83\u4fee\u6539\u4e86\u8303\u56f4\u94fe\uff0c\u56e0\u6b64\u9700\u8981\u82b1\u8d39\u66f4\u591a\u65f6\u95f4\u5230\u5176\u5b83\u8303\u56f4\u53bb\u67e5\u627e\u3002<\/p>\n

\u25c6\u907f\u514d\u6d4f\u89c8\u5668\u5185\u5b58\u6cc4\u6f0f<\/p>\n

\u5bf9\u4e8eWeb\u5e94\u7528\u7a0b\u5e8f\u800c\u8a00\uff0c\u5185\u5b58\u6cc4\u6f0f\u662f\u5f88\u5e38\u89c1\u7684\u4e8b\u60c5\uff0c\u53ef\u80fd\u56e0\u6b64\u5bfc\u81f4\u5de8\u5927\u7684\u6027\u80fd\u95ee\u9898\u3002\u56e0\u4e3a\u6d4f\u89c8\u5668\u7684\u5185\u5b58\u4f7f\u7528\u5728\u589e\u957f\uff0c\u4f60\u7684Web\u5e94\u7528\u7a0b\u5e8f\u548c\u5176\u5b83\u7a0b\u5e8f\u5c31\u4f1a\u53d8\u6162\uff0c\u6700\u5e38\u89c1\u7684\u5185\u5b58\u6cc4\u6f0f\u662f\u5728JavaScript\u5f15\u64ce\u548c\u6d4f\u89c8\u5668C++\u5bf9\u8c61\u5b9e\u73b0\u7684DOM\u4e4b\u95f4\u5f62\u6210\u4e86\u5faa\u73af\u5f15\u7528\uff0c\u5982\u5728JavaScript\u5f15\u64ce\u548cIE\u6d4f\u89c8\u5668\u7684COM\u57fa\u7840\u7ed3\u6784\u4e4b\u95f4\uff0c\u4ee5\u53caJavaScript\u5f15\u64ce\u548cFirefox  XPCOM\u57fa\u7840\u7ed3\u6784\u4e4b\u95f4\u3002<\/p>\n

\u4f18\u5316\u7f51\u9875\u56fe\u7247<\/strong><\/p>\n

\u5f53\u4f60\u5728\u4f18\u5316\u7f51\u9875\u4ee3\u7801\u65f6\uff0c\u522b\u5fd8\u4e86\u90a3\u4e9b\u9759\u6001\u5185\u5bb9\uff0c\u5305\u62ec\u56fe\u7247\uff0c\u7ecf\u8fc7\u7b80\u5355\u7684\u4f18\u5316\u5c31\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u4e0b\u8f7d\u5927\u5c0f\uff0c\u5e76\u4e14\u4e5f\u4e0d\u4f1a\u964d\u4f4e\u7f51\u7ad9\u7684\u8d28\u91cf\u3002<\/p>\n

\u6211\u4eec\u603b\u7ed3\u4e86\u4e00\u4e9b\u6280\u5de7\uff0c\u53ef\u4ee5\u5e2e\u52a9\u4f60\u52a0\u5feb\u7f51\u9875\u56fe\u7247\u7684\u8f7d\u5165\u901f\u5ea6\uff1a<\/p>\n

\u25c6\u526a\u88c1\u6389\u591a\u4f59\u7684\u7a7a\u767d
<\/p>\n

\u5982\u679c\u786e\u5b9e\u9700\u8981\u7a7a\u767d\u5185\u8fb9\u8ddd\uff0c\u53ef\u4ee5\u4f7f\u7528css\u4ee3\u7801\u6765\u5b9e\u73b0\u3002<\/p>\n

\u25c6\u4f7f\u7528\u6700\u4f73\u7684\u6587\u4ef6\u683c\u5f0f<\/p>\n

\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e9b\u4e13\u4e1a\u7684\u56fe\u7247\u5904\u7406\u5de5\u5177\uff0c\u5982photoshop\u5c31\u53ef\u4ee5\u76f4\u63a5\u4fdd\u5b58\u4e3a\u7f51\u9875\u56fe\u7247\uff0c\u5982\u679c\u5c06\u56fe\u7247\u989c\u8272\u4ece256\u8272\u8c03\u6574\u523032\u8272\uff0c\u90a3\u6587\u4ef6\u5927\u5c0f\u4f1a\u660e\u663e\u53d8\u5c0f\uff0c\u4e0b\u9762\u6765\u770b\u770b\u4e00\u5f20\u56fe\u7247\u4e0d\u540c\u6587\u4ef6\u683c\u5f0f\u65f6\u7684\u5927\u5c0f\u5bf9\u6bd4\u3002
<\/p>\n

\u4e0a\u9762\u8fd9\u5f20\u56fe\u7247\u4e0d\u540c\u6587\u4ef6\u683c\u5f0f\u65f6\u7684\u5927\u5c0f\u5bf9\u6bd4\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

\u25c7JPG, 60 quality – 32K<\/p>\n

\u25c7PNG-8, 256 colors – 37K<\/p>\n

\u25c7GIF, 256 colors – 42K<\/p>\n

\u25c7PNG-24 – 146K<\/p>\n

\u7531\u4e8e8\u4f4dpng\u548cgif\u683c\u5f0f\u76f8\u5bf9\u800c\u8a00\u56fe\u50cf\u8d28\u91cf\u4e0d\u9519\uff0c\u6587\u4ef6\u5927\u5c0f\u66f4\u5c0f\uff0c\u56e0\u6b64\u5728\u7f51\u9875\u4e2d\u5efa\u8bae\u591a\u4f7f\u7528\u8fd9\u4e24\u79cd\u683c\u5f0f\u3002<\/p>\n

PHP\u6027\u80fd\u6280\u5de7<\/strong><\/p>\n

\u6ce8\uff1a\u5bf9\u4e8e\u4ee5\u4e0b\u8fd9\u90e8\u5206\u5185\u5bb9\uff0cPHP\u5c0f\u7ec4\u5df2\u53d1\u5e03\u516c\u5f00\u4fe1\u53cd\u9a73\uff0c\u5176\u4e2d\u7684\u6709\u4e9b\u5efa\u8bae\u7a76\u7adf\u662f\u5426\u6b63\u786e\u8fd8\u6709\u5f85\u8fdb\u4e00\u6b65\u7814\u7a76\u3002<\/p>\n

\u7531\u4e8ePHP\u7684\u4f7f\u7528\u91cf\u975e\u5e38\u5927\uff0c\u6240\u4ee5\u6709\u5fc5\u8981\u653e\u5728\u8fd9\u91cc\u8bf4\u4e00\u8bf4\u3002\u9996\u5148\u6709\u4e00\u70b9\u9700\u8981\u9610\u660e\u7684\u662f\uff0c\u7f51\u7ad9\u7684\u6027\u80fd\u4e0ePHP\u7248\u672c\uff0cWeb\u670d\u52a1\u5668\u73af\u5883\u548c\u4ee3\u7801\u7684\u590d\u6742\u5ea6\u90fd\u662f\u6709\u5173\u7684\u3002<\/p>\n

\u25c6\u5347\u7ea7PHP\u7248\u672c<\/p>\n

\u9996\u5148\u8981\u505a\u7684\u662f\u5347\u7ea7PHP\u7248\u672c\uff0c\u5982\u679c\u4f60\u8fd8\u5728\u4f7f\u7528PHP3\u6216PHP4\uff0c\u90a3\u8d76\u5feb\u5347\u7ea7\u5427\uff01<\/p>\n

\u25c6\u4f7f\u7528\u7f13\u5b58<\/p>\n

\u4f7f\u7528\u7f13\u5b58\u6a21\u5f0f\uff0c\u5982memcached\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\u6216\u7f51\u9875\u7f13\u5b58\u8d77\u6765\uff0c\u52a0\u5febWeb\u670d\u52a1\u5668\u7684\u54cd\u5e94\u901f\u5ea6\u3002<\/p>\n

\u25c6\u4f7f\u7528\u7f13\u51b2\u8f93\u51fa<\/p>\n

PHP\u4f7f\u7528\u5185\u5b58\u7f13\u51b2\u5b58\u50a8\u4f60\u7684\u811a\u6b65\u5c1d\u8bd5\u6253\u5370\u7684\u6240\u6709\u6570\u636e\uff0c\u8fd9\u4e2a\u7f13\u51b2\u770b\u8d77\u6765\u597d\u50cf\u8ba9\u4f60\u7684\u7f51\u9875\u53d8\u6162\uff0c\u56e0\u4e3a\u7528\u6237\u5fc5\u987b\u7b49\u5f85\u7f13\u51b2\u88ab\u586b\u6ee1\uff0c\u5e78\u8fd0\u7684\u662f\uff0c\u4f60\u53ef\u4ee5\u505a\u4e00\u4e9b\u4fee\u6539\u5f3a\u5236\u8ba9PHP\u5feb\u901f\u6e05\u7a7a\u8f93\u51fa\u7f13\u51b2\u3002<\/p>\n

\u25c6\u6ca1\u6709\u539f\u56e0\u5c3d\u91cf\u4e0d\u8981\u590d\u5236\u53d8\u91cf<\/p>\n

\u6709\u4e9bPHP\u65b0\u624b\u8bd5\u56fe\u901a\u8fc7\u62f7\u8d1d\u9884\u5148\u5b9a\u4e49\u7684\u53d8\u91cf\u4f7f\u4ee3\u7801\u53d8\u5f97\u6e05\u6670\uff0c\u4f46\u4e8b\u5b9e\u662f\u8fd9\u6837\u4f1a\u5bfc\u81f4\u53cc\u500d\u7684\u5185\u5b58\u6d88\u8017\u3002\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u6709\u4e2a\u4e0d\u6000\u597d\u610f\u7684\u7528\u6237\u5411\u6587\u672c\u533a\u57df\u63d2\u5165\u4e86512KB\u7684\u5185\u5bb9\uff0c\u90a3\u4e48\u4f1a\u4f7f\u75281MB\u5185\u5b58\uff1a<\/p>\n

$description = strip_tags($_POST[‘description’]); echo $description;  \u4e0a\u9762\u8fd9\u4e2a\u4f8b\u5b50\u5c31\u662f\u6ca1\u6709\u539f\u56e0\u7684\u62f7\u8d1d\u53d8\u91cf\uff0c\u5176\u5b9e\u53ef\u4ee5\u7b80\u5316\u5b83\uff0c\u907f\u514d\u989d\u5916\u7684\u5185\u5b58\u6d88\u8017\uff1a<\/p>\n

echo strip_tags($_POST[‘description’]);  \u25c6\u907f\u514d\u5728\u5faa\u73af\u4e2d\u6267\u884cSQL\u67e5\u8be2<\/p>\n

\u4e00\u4e2a\u5e38\u72af\u7684\u9519\u8bef\u662f\u5728\u5faa\u73af\u4e2d\u4f7f\u7528SQL\u67e5\u8be2\uff0c\u8fd9\u6837\u4f1a\u5f15\u8d77\u591a\u6b21\u6570\u636e\u5e93\u5f80\u8fd4\uff0c\u964d\u4f4e\u811a\u672c\u901f\u5ea6\uff0c\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u4f60\u53ef\u4ee5\u4fee\u6539\u5faa\u73af\u6784\u5efa\u4e00\u4e2aSQL\u67e5\u8be2\uff0c\u4e00\u6b21\u6027\u63d2\u5165\u6240\u6709\u7684\u7528\u6237\uff1a<\/p>\n

foreach ($userList as $user) {   $query = ‘Insert INTO users (first_name,last_name) VALUES(“‘ . $user[‘first_name’] . ‘”, “‘ . $user[‘last_name’] . ‘”)’;   mysql_query($query); } \u6539\u4e3a\uff1a<\/p>\n

Insert INTO users (first_name,last_name) VALUES(“John”, “Doe”)  \u4e0d\u7528\u5faa\u73af\uff0c\u4f60\u53ef\u4ee5\u5408\u5e76\u6210\u4e00\u6b21\u6570\u636e\u5e93\u67e5\u8be2\uff1a<\/p>\n

$userData = []; foreach ($userList as $user) {   $userData[] = ‘(“‘ . $user[‘first_name’] . ‘”, “‘ . $user[‘last_name’] . ‘”)’; } $query = ‘Insert INTO users (first_name,last_name) VALUES’ . implode(‘,’, $iserData); mysql_query($query);Produces: Insert INTO users (first_name,last_name) VALUES(“John”, “Doe”),(“Jane”, “Doe”)… \u25c6\u4e3a\u957f\u5b57\u7b26\u4e32\u4f7f\u7528\u5355\u5f15\u53f7<\/p>\n

PHP\u5141\u8bb8\u5bf9\u5b57\u7b26\u4e32\u53d8\u91cf\u5c01\u88c5\u540c\u65f6\u4f7f\u7528\u5355\u5f15\u53f7\u548c\u53cc\u5f15\u53f7\uff0c\u4f46\u662f\u662f\u6709\u533a\u522b\u7684\uff0c\u4f7f\u7528\u53cc\u5f15\u53f7\u65f6\uff0c\u544a\u8bc9PHP\u5f15\u64ce\u8bfb\u53d6\u5b57\u7b26\u4e32\u5185\u5bb9\u5e76\u67e5\u627e\u53d8\u91cf\uff0c\u7136\u540e\u4f7f\u7528\u5b83\u4eec\u7684\u503c\u66ff\u6362\u5b83\u4eec\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u5f88\u957f\u7684\u4f46\u6ca1\u6709\u5305\u542b\u53d8\u91cf\u7684\u5b57\u7b26\u4e32\uff0c\u5c06\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n

\u25c6\u4f7f\u7528switch\/case\u66ff\u4ee3if\/else<\/p>\n

\u4f7f\u7528switch\/case\u6bd4\u4f7f\u7528if\/else\u6027\u80fd\u66f4\u597d\uff0c\u6613\u8bfb\u6027\u548c\u6613\u7ef4\u62a4\u6027\u4e5f\u66f4\u4f73\u3002<\/p>\n

\u9884\u53d6\u8d44\u6e90<\/strong><\/p>\n

\u9884\u53d6\u8d44\u6e90\u5c31\u662f\u5f53\u7528\u6237\u8fd8\u6ca1\u6709\u8bf7\u6c42\u8be5\u8d44\u6e90\u5c31\u9884\u5148\u4e0b\u8f7d\u5230\u672c\u5730\uff0c\u90a3\u5f53\u7528\u6237\u771f\u6b63\u8bf7\u6c42\u65f6\uff0c\u53ef\u4ee5\u5927\u5927\u51cf\u5c0f\u7f51\u7edc\u5ef6\u8fdf\u65f6\u95f4\uff0c\u751a\u81f3\u6d88\u9664\u7f51\u7edc\u5ef6\u8fdf\u65f6\u95f4\u3002<\/p>\n

\u5bf9\u4e8e\u4ea4\u4e92\u5f0f\u7f51\u7ad9\uff0c\u4f18\u5316\u901f\u5ea6\u4e0d\u4ec5\u4ec5\u662f\u51cf\u5c0f\u521d\u59cb\u4e0b\u8f7d\u5927\u5c0f\uff0c\u5f53\u7528\u6237\u4ea4\u4e92\u65f6\u53ef\u4ee5\u4e0b\u8f7d\u989d\u5916\u7684\u8d44\u6e90\uff0c\u8fd9\u4e9b\u884c\u4e3a\u7684\u901f\u5ea6\u4f9d\u8d56\u4e8e\u4e0b\u8f7d\u8fd9\u4e9b\u8d44\u6e90\u7684\u65f6\u95f4\uff0c\u5c06\u4e0b\u8f7d\u8d44\u6e90\u53d8\u5c0f\u53ef\u4ee5\u52a0\u5feb\u7f51\u7ad9\u901f\u5ea6\u3002\u5728\u8bbe\u8ba1\u9884\u53d6\u8d44\u6e90\u65f6\u8981\u8003\u8651\u4ee5\u4e0b\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n

\u25c6\u7814\u7a76\u7528\u6237\u884c\u4e3a<\/p>\n

\u5982\u679c\u4f60\u7684\u7528\u6237\u5728\u67d0\u4e2a\u7279\u5b9a\u7684\u9875\u9762\u6216\u884c\u4e3a\u4e0a\u82b1\u8d39\u4e86\u5927\u91cf\u7684\u65f6\u95f4\uff0c\u90a3\u8fd9\u5c31\u662f\u4f60\u8be5\u4f18\u5316\u7684\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u67e5\u627e\u670d\u52a1\u5668\u65e5\u5fd7\u6765\u627e\u51fa\u8fd9\u4e9b\u9875\u9762\u548c\u884c\u4e3a\u3002\u5bf9\u4e8epicasa\u7f51\u7edc\u76f8\u518c\uff0c\u6211\u4eec\u77e5\u9053\u6700\u591a\u7684\u64cd\u4f5c\u662f\u4e00\u5f20\u5f20\u6d4f\u89c8\u56fe\u7247\uff0c\u90a3\u4e48\u8fd9\u5c31\u662f\u975e\u5e38\u5408\u9002\u7684\u9884\u53d6\u5bf9\u8c61\u3002<\/p>\n

\u25c6\u8861\u91cf\u7f51\u9875\u51c6\u597d\u7684\u65f6\u95f4<\/p>\n

\u5728\u5f53\u524d\u9875\u9762\u6ca1\u6709\u663e\u793a\u5b8c\u65f6\u4e0d\u5e94\u8be5\u63d0\u53d6\u65b0\u9875\u9762\u7684\u6570\u636e\uff0c\u5bf9\u4e8e\u52a8\u6001\u9875\u9762\uff0c\u4f60\u9700\u8981\u4e3a\u9875\u9762\u4e0a\u6bcf\u4e2a\u5916\u90e8\u6587\u4ef6\u6dfb\u52a0JavaScript\u8f7d\u5165\u5904\u7406\u7a0b\u5e8f\uff0c\u5f53\u8fd9\u4e9b\u8d44\u6e90\u5168\u90e8\u4e0b\u8f7d\u4e0b\u6765\u540e\uff0c\u4e3a\u7528\u6237\u4e0b\u4e00\u4e2a\u884c\u4e3a\u9884\u53d6\u6570\u636e\u5c31\u975e\u5e38\u5408\u7406\u4e86\u3002<\/p>\n

\u25c6\u4f7f\u7528\u5de5\u5177\u6d4b\u8bd5<\/p>\n

\u5728\u6b63\u5f0f\u4fee\u6539\u4ee3\u7801\u524d\uff0c\u5148\u7528Page Speed\u8fd9\u7c7b\u5de5\u5177\u8fdb\u884c\u6d4b\u91cf\uff0c\u8981\u907f\u514d\u4e00\u6b21\u63d0\u53d6\u592a\u591a\u6570\u636e\u9020\u6210\u7f51\u7ad9\u53d8\u6162\u3002<\/p>\n

\u9002\u5f53\u7684\u5305\u542b\u6837\u5f0f\u548c\u811a\u672c<\/p>\n

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\u8054\u5408\u5916\u90e8JavaScript\u6587\u4ef6<\/strong><\/p>\n

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