{"id":2935,"date":"2013-01-17T18:54:06","date_gmt":"2013-01-17T10:54:06","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=2935"},"modified":"2018-01-02T02:30:19","modified_gmt":"2018-01-01T18:30:19","slug":"absolute-display-visibility-reflow","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2013\/01\/absolute-display-visibility-reflow\/","title":{"rendered":"\u5b9e\u9a8c\uff1aabsolute\/display\u9690\u85cf\u4e0e\u56de\u6d41\u7b49\u6027\u80fd"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=2935<\/a><\/p>\n

\u4e00\u3001\u6545\u4e8b\u603b\u6709\u5176\u80cc\u666f<\/h3>\n

\u5f53\u6211\u8fd8\u662f\u5c0f\u767d\u7684\u65f6\u5019\uff0c\u66fe\u7ecf\u6295\u8fc7\u652f\u4ed8\u5b9d\u7684\u7b80\u5386\u2026\u2026\u8fd9\u4e9b\u90fd\u4e0d\u662f\u91cd\u70b9\u3002\u7535\u8bdd\u9762\u8bd5\u7684\u65f6\u5019\uff0c\u66fe\u88ab\u95ee\u8fc7\u56de\u6d41(reflow)\u7684\u95ee\u9898\uff08\u56e0\u5f53\u65f6\u535a\u5ba2\u521a\u7ffb\u8bd1\u8fc7\u5173\u4e8e\u56de\u6d41\u7684\u6587\u7ae0\uff09\u2026\u2026\u8fd9\u4e9b\u4e5f\u4e0d\u662f\u91cd\u70b9\u3002\u91cd\u70b9\u5176\u4e2d\u6709\u4e2a\u8ba9\u6211\u4e00\u76f4\u803f\u803f\u4e8e\u60003\u5e74\u7684\u95ee\u9898\uff1a\u5143\u7d20\u5e94\u7528position:absolute<\/code>\u8131\u79bb\u6587\u6863\u6d41\u8fd9\u4e00\u8fc7\u7a0b\u4f1a\u4e0d\u4f1a\u4ea7\u751f\u56de\u6d41\uff1f<\/p>\n

\u5f53\u65f6\u9762\u8bd5\u8005\u8ba4\u4e3a – \u4e0d\u4f1a\uff1b\u800c\u6211\u6839\u636e\u81ea\u5df1\u7684\u7406\u89e3\uff0c\u51b3\u7684\u5e94\u8be5\u4f1a\u7684\u3002 \u65e0\u75be\u800c\u7ec8\u7684\u4e89\u8bba\u2026\u2026\u5f80\u540e\u8fd9N\u5e74\uff0c\u6211\u66f4\u591a\u662f\u6309\u7167\u5f53\u65f6\u524d\u8f88\u7684\u89c2\u70b9\u8d70\u7684\uff0c\u4f1a\u65f6\u4e0d\u65f6\u4f7f\u7528absolute<\/code>\u9690\u85cf\u5143\u7d20\uff0c\u201c\u907f\u514d\u56de\u6d41\u201d\u3002<\/p>\n

\u4e0a\u5468\u547d\u4e2d\u6ce8\u5b9a\u2460<\/sup>\u63a5\u89e6\u4e86Opera\u6d4f\u89c8\u5668\u4e2dProfiler\u5206\u6790\u5de5\u5177\uff0c\u5176\u4e2d\u6709\u4e00\u9879\u8ba9\u6211\u5f88\u611f\u5174\u8da3\uff0c\u5c31\u662fReflow, \u5982\u4e0b\u56fe\u6240\u793a\uff1a
\n\"profiler\u5de5\u5177\u4e2d\u7684reflow\u9879<\/p>\n

\/\/zxx: \u2460 \u6240\u8c13\u201c\u547d\u4e2d\u6ce8\u5b9a\u201d\u6307\u6982\u7387\u5b66\u4e0a\u7684\u8bf4\u6cd5\uff1b\u6bcf\u5929\u90fd\u5230\u5904\u95f2\u6643\u6c72\u53d6\u65b0\u77e5\u8bc6\uff0c\u603b\u6709\u4e00\u5929\u4f1a\u9047\u5230Profiler\u7684\u3002<\/span><\/p>\n

\u6709\u4e86\u8fd9\u4e2a\u4e1c\u897f\uff0c\u5c31\u53ef\u4ee5\u89e3\u51b3\u56f0\u6270\u62113\u5e74\u4e4b\u524d\u7684\u95ee\u9898\u4e86\uff0c\u6211\u53ea\u8981\u5236\u4f5c\u4e00\u4e2ademo\uff0c\u4e00\u756a\u6d4b\u8bd5\u5c31\u53ef\u4ee5\u4e86\u3002\u8fd9\u5c31\u662f\u672c\u6587\u7684\u8d77\u6e90\uff0c\u5982\u679c\u975e\u8981\u8ffd\u672c\u6eaf\u6e90\uff0c\u672c\u6587\u7684\u4ea7\u751f\u7684\u6700\u6839\u672c\u539f\u56e0\u662f\u2026\u2026\u2026\u2026\u4eba\u7c7b\u8bde\u751f\u4e86\u6216\u8005\u66f4\u4e45\u8fdc~~<\/p>\n

\u4e8c\u3001\u5143\u7d20\u7edd\u5bf9\u5b9a\u4f4d\u4e0e\u56de\u6d41<\/h3>\n

1. \u5173\u4e8edemo<\/strong>
\nOpera\u662f\u4e2a\u6027\u80fd\u76f8\u5f53\u4e0d\u9519\u7684\u6d4f\u89c8\u5668\uff0c\u8981\u60f3\u5236\u4f5c\u4e00\u4e2a\u53ef\u4ee5\u663e\u793a\u51fa\u65f6\u95f4\u7684demo\u53ef\u4e0d\u662f\u4ef6\u5bb9\u6613\u7684\u4e8b\u60c5\uff0c\u7b80\u5355\u7684\u51e0\u4e2adiv\u5c42\u7684reflow\u65f6\u95f4\u5fc5\u7136\u662f0ms, \u5230\u5e95\u662f\u6709\u56de\u6d41\u5462\u8fd8\u662f\u6ca1\u6709\u5462\uff1f\u56de\u6d41\u7684\u65f6\u95f4\u4e0edom\u7684\u6df1\u5ea6\u6709\u5173\uff0c\u56e0\u6b64\uff0c\u672c\u6587\u7684\u6240\u6709demo\u90fd\u662f\u5185\u90e8\u4e3a\u5fa1\u7528\u56fe\u7247\u7684498\u5c42<\/strong>\u2461<\/sup>\u5d4c\u5957div\u3002\u56e0\u6b64\uff0c\u53cb\u60c5\u63d0\u9192\uff1a\u5343\u4e07\u4e0d\u8981\u4f7f\u7528firebug\u7b49\u5de5\u5177\u53bb\u67e5\u770bHTML\u4ee3\u7801<\/strong>\uff0c\u6d4f\u89c8\u5668\u5d29\u6389none of my business\uff01<\/p>\n

\/\/zxx: \u2461 \u8c8c\u4f3cOpera\u4e2d\u6709500\u5c42\u6807\u7b7e\u6700\u5927\u5d4c\u5957\u7684\u663e\u793a\uff0c498\u4e2adiv\u5c42+1\u4e2ap\u6807\u7b7e\u5c42+1\u4e2abutton\u6807\u7b7e=500\u5c42\uff1b\u5c42\u7ea7\u518d\u9ad8\u5c31\u4f1a\u663e\u793a\u5f02\u5e38\u3002FireFox\u6d4f\u89c8\u5668\u6700\u5927\u5c42\u7ea7\u663e\u793a\u4f3c\u4e4e\u5c0f\u5f97\u591a\uff0cChrome\u6d4f\u89c8\u5668\u8c8c\u4f3c\u6ca1\u6709\u95ee\u9898\uff0c\u6211\u5c1d\u8bd5\u4e86800\u5c42\u5d4c\u5957\u4e5f\u662f\u77ac\u95f4\u663e\u793a\u65e0\u538b\u529b\u3002<\/span><\/p>\n

demo1, \u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u5143\u7d20absolute\u4e0e\u56de\u6d41demo<\/a><\/p>\n

2. \u6d4b\u8bd5follow me<\/strong>
\n\u5728\u8f83\u65b0\u7248\u672c\u7684Opera\u6d4f\u89c8\u5668\u4e0a\u6253\u5f00\u4e0a\u9762demo\u9875\u9762\uff08\u6ca1\u6709\u7684\u76f4\u63a5\u770b\u622a\u56fe\u4ee5\u53ca\u6570\u636e\u54c8~\uff09\uff0c\u53f3\u952e\u9875\u9762\u2192\u68c0\u67e5\u5143\u7d20\uff0c\u6253\u5f00\u5de5\u5177\u9762\u677f\uff0c\u5207\u6362\u5230\u4e0b\u56fe\u6240\u793a\u8fd9\u4e00\u9879\uff08\u4f1a\u7981\u7528\u5176\u4ed6\u6240\u6709\u9879\uff0c\u4e3a\u4e86\u66f4\u51c6\u786e\u7ed3\u679c\uff09\uff1a
\n\"\u9762\u677f\u4e0a\u7684profiler\u7684\u5de5\u5177\u9879<\/p>\n

\u7136\u540e\u70b9\u51fb\u5de6\u4e0a\u65b9\u90a3\u4e2a\u7ea2\u8272\u5706\u70b9\u6309\u94ae\uff0c\u5f00\u59cb\u8bb0\u5f55JS\u7ebf\u7a0b\u3001CSS\u6837\u5f0f\u3001\u56de\u6d41\u3001\u5e03\u5c40\u3001\u6e32\u67d3\u7b49\u3002
\n\"\u5f00\u59cbprofiler\u6309\u94ae\"<\/p>\n

\u70b9\u51fbdemo\u9875\u9762\u4e2d\u95f4\u533a\u57df\u7684\u6309\u94ae\uff08\u6216\u8005tab\u952efocus\u6309\u94ae\u56de\u8f66\u89e6\u53d1\uff09\uff0c\u89e6\u53d1\u56fe\u7247\u7684position\u72b6\u6001\u53d8\u5316\uff0c\u5927\u7ea610\u6b21\u8fde\u7eed\u89e6\u53d1\u540e\u2462<\/sup>\uff0c\u518d\u6b21\u70b9\u51fb\u5de6\u4e0a\u65b9\u90a3\u4e2a\u7ea2\u8272\u5706\u70b9\u6309\u94ae\uff0c\u505c\u6b62\u8bb0\u5f55\u3002
\n\"\u6d4b\u8bd5\u89e6\u53d1\u6309\u94ae\" \"\u505c\u6b62\u8bb0\u5f55\u6309\u94ae\"<\/p>\n

\/\/zxx:\u2462 \u56de\u6d41\u7b49\u6570\u636e\u7684\u4ea7\u751f\u662f\u6709\u6ce2\u52a8\u7684\uff0c\u4e00\u6b21\u72b6\u6001\u7684\u6539\u53d8\u5e76\u4e0d\u80fd\u51c6\u786e\u53cd\u6620\u662f\u5426\u771f\u7684\u4ea7\u751f\u4e86\u53d8\u5316\u3002<\/span><\/p>\n

\u4e0b\u56fe\u4e3a\u4e00\u6b21\u70b9\u51fb\u6309\u94ae\u89e6\u53d1\u7684\u666e\u901a\u8bb0\u5f55\u2463<\/sup>\uff1a
\n\"\u8bb0\u5f55\u7684\u4e00\u6b21\u7ed3\u679c\"<\/p>\n

\/\/zxx:\u2463 \u4e0a\u622a\u56fe\u7b2c\u4e00\u4e2a\u56de\u6d41\u65f6\u95f4\u8981\u957f\u4e00\u70b9\uff0c\u662f\u56e0\u4e3a\u4e3a\u4e86\u9632\u6b62\u4e8c\u6b21\u70b9\u51fb\uff0c\u6309\u94aedisabled\u9020\u6210\u4e86\u5197\u4f59\u56de\u6d41\uff0c\u56de\u6d4116m\u65f6\u957f\u504f\u5927\u3002\u73b0\u5728\u5df2\u53bb\u9664\u4e86\u8fd9\u4e2a\u5e72\u6270\u9879\u3002\u4f46\u4e0d\u5f71\u54cd\u7ec8\u7ed3\u8bba\u3002<\/span><\/p>\n

\u4ece\u4e2d\u6211\u4eec\u53ef\u4ee5\u57fa\u672c<\/strong>\u53ef\u4ee5\u5f97\u5230\u4e00\u4e9b\u7ed3\u8bba\uff1a<\/p>\n

    \n
  1. \u5143\u7d20position<\/code>\u5728absolute<\/code>\u548cstatic<\/code>\u4e4b\u95f4\u5207\u6362\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u4ea7\u751f\u56de\u6d41\uff1b<\/li>\n
  2. \u9f20\u6807\u7ecf\u8fc7\u6309\u94ae\u7684\u5185\u53d1\u5149\u7b49\u6548\u679c\u4ea7\u751f\u7684\u6e32\u67d3\u8fdc\u6bd4\u56fe\u7247\u4e7e\u5764\u5927\u632a\u79fb\u6765\u7684\u5927\uff1b<\/li>\n
  3. \u5e03\u5c40\u7684\u65f6\u95f4\u70b9\u5728\u6e32\u67d3\u7a0d\u524d\u4e00\u70b9\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5148\u5e03\u5c40\u518d\u6e32\u67d3\u3002<\/li>\n<\/ol>\n

    \u4ee5\u4e0a\u7ed3\u8bba\u53ea\u80fd\u7b97\u4f5c\u5047\u8bbe\uff0c\u56e0\u4e3a\u7f3a\u5c11\u5bf9\u7167\u5b9e\u9a8c\u7ec4\u3002\u6839\u636ereflow\u786e\u5b9a\u7684\u7ed3\u8bba\uff0c\u5143\u7d20visibility:hidden<\/code>\u65f6\u5019\u4e0d\u4f1a\u4ea7\u751f\u56de\u6d41\uff0c\u56e0\u6b64\uff0c\u6211\u53c8\u5236\u4f5c\u4e86\u4e00\u4e2a\u5bf9\u6bd4demo\uff0c\u5176\u4e2d\u56fe\u7247\u5207\u6362\u72b6\u6001\u662fvisibility<\/code>\u4e3ahidden\/visibile<\/code>.<\/p>\n

    \u4e09\u3001visibility\u5bf9\u6bd4\u8bd5\u9a8c<\/h3>\n

    demo2, \u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1avisibility\u4e0e\u56de\u6d41\u5bf9\u6bd4demo<\/a><\/p>\n

    \u7ed3\u679c\u5982\u4e0b\uff08\u56de\u8f66\u6d4b\u8bd5\uff09\uff1a
    \n\"visibility\u4e0e\u56de\u6d41\u6d4b\u8bd5\u7ed3\u679c\u622a\u56fe<\/p>\n

    \u5bf9\u6bd4\u540c\u7b49\u64cd\u4f5c\u4e0b\u7684position<\/code>\u7ed3\u679c\uff1a
    \n\"position\u4e0e\u56de\u6d41\u6d4b\u8bd5\u7ed3\u679c<\/p>\n

    \u53ef\u4ee5\u53d1\u73b0\uff0c\u5143\u7d20position<\/code>\u5c5e\u6027\u4e0b\u6587\u6863\u6d41\u8131\u79bb\u4e0e\u5426\u7684\u53d8\u5316\u662f\u4f1a\u4ea7\u751f\u56de\u6d41\u7684\uff1bvisibility\u4e0d\u4f1a\uff01\u800c\u4e14\uff0cvisibility\u9690\u85cf\u65e0\u9700\u91cd\u65b0\u5e03\u5c40\uff0c\u6e32\u67d3\u65f6\u95f4\u4e5f\u77ed\u3002\u4e0d\u8fc7\u6709\u70b9\u4e0d\u89e3\u7684\u662fCSS\u6837\u5f0f\u65f6\u95f4\u957f\u4e86\u5f88\u591a\uff08\u7ea2\u8272\u4e0b\u5212\u7ebf\u6807\u793a\uff09\uff1f\u6c42\u89e3\uff01<\/p>\n

    \u56db\u3001\u5143\u7d20\u9690\u85cf\u65b9\u6cd5\u4e0e\u56de\u6d41\u3001\u5e03\u5c40\u3001\u6e32\u67d3\u65f6\u95f4<\/h3>\n

    \u5143\u7d20\u9690\u85cf\u4e0d\u53ef\u89c1\u6709\u5f88\u591a\u65b9\u6cd5\uff0c\u5982\u4e0b3\u4e2a\u65b9\u6cd5\u662f\u6211\u6bd4\u8f83\u5e38\u7528\u7684\uff1a<\/p>\n

      \n
    1. position:absolute; top:-999em; <\/code>\u5c4f\u5e55\u9605\u8bfb\u5668\u53ef\u8bc6\u522b\u3002<\/li>\n
    2. position:absolute; visibility:hidden;<\/code> \u5c4f\u5e55\u9605\u8bfb\u5668\u4e0d\u53ef\u8bc6\u522b\u3002<\/li>\n
    3. display:none; <\/code>\u5c4f\u5e55\u9605\u8bfb\u5668\u4e0d\u53ef\u8bc6\u522b\u3002<\/li>\n<\/ol>\n

      \u4e0b\u9762\uff0c\u6211\u5c06\u591a\u6b21\u7684\u5bf9\u6bd4\u6d4b\u8bd5\u770b\u770b\u54ea\u79cd\u9690\u85cf\u53ef\u7528\u6027\u6700\u9ad8\uff01<\/p>\n

      \u4e09\u4e2a\u9690\u85cf\u65b9\u6cd5\u6d4b\u8bd5demo\u4f9d\u6b21\u4e3a\uff1ademo3-1<\/a>, demo3-2<\/a>, demo3-3<\/a><\/p>\n

      \u6bcf\u4e2a\u65b9\u6cd5\u6d4b\u8bd510\u6b21\uff0c\u5e76\u7b97\u51fa\u5e73\u5747\u65f6\u95f4\u503c\u3002\u5177\u4f53\u6570\u636e\u53c2\u89c1\u4e0b\u8868\uff08\u6b22\u8fce\u8d28\u7591\uff09\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      <\/th>\ntop:-999em\u65b9\u6cd5<\/th>\nvisibility:hidden\u65b9\u6cd5<\/th>\ndisplay:none\u65b9\u6cd5<\/th>\n<\/tr>\n
      \u56de\u6d41(ms)<\/td>\n\u5e03\u5c40(ms)<\/td>\n\u6e32\u67d3(ms)<\/td>\n\u56de\u6d41(ms)<\/td>\n\u5e03\u5c40(ms)<\/td>\n\u6e32\u67d3(ms)<\/td>\n\u56de\u6d41(ms)<\/td>\n\u5e03\u5c40(ms)<\/td>\n\u6e32\u67d3(ms)<\/td>\n<\/tr>\n
      \u7b2c1\u6b21<\/th>\n0<\/td>\n34<\/td>\n69<\/td>\n0<\/td>\n28<\/td>\n78<\/td>\n1<\/td>\n28<\/td>\n73<\/td>\n<\/tr>\n
      \u7b2c2\u6b21<\/th>\n2<\/td>\n30<\/td>\n81<\/td>\n1<\/td>\n26<\/td>\n72<\/td>\n1<\/td>\n31<\/td>\n81<\/td>\n<\/tr>\n
      \u7b2c3\u6b21<\/th>\n1<\/td>\n37<\/td>\n82<\/td>\n0<\/td>\n30<\/td>\n80<\/td>\n0<\/td>\n33<\/td>\n77<\/td>\n<\/tr>\n
      \u7b2c4\u6b21<\/th>\n2<\/td>\n23<\/td>\n72<\/td>\n1<\/td>\n28<\/td>\n72<\/td>\n1<\/td>\n36<\/td>\n82<\/td>\n<\/tr>\n
      \u7b2c5\u6b21<\/th>\n1<\/td>\n37<\/td>\n71<\/td>\n0<\/td>\n30<\/td>\n73<\/td>\n0<\/td>\n31<\/td>\n80<\/td>\n<\/tr>\n
      \u7b2c6\u6b21<\/th>\n1<\/td>\n26<\/td>\n76<\/td>\n0<\/td>\n31<\/td>\n78<\/td>\n1<\/td>\n25<\/td>\n67<\/td>\n<\/tr>\n
      \u7b2c7\u6b21<\/th>\n0<\/td>\n29<\/td>\n72<\/td>\n0<\/td>\n30<\/td>\n74<\/td>\n0<\/td>\n27<\/td>\n74<\/td>\n<\/tr>\n
      \u7b2c8\u6b21<\/th>\n1<\/td>\n28<\/td>\n72<\/td>\n1<\/td>\n29<\/td>\n74<\/td>\n0<\/td>\n36<\/td>\n90<\/td>\n<\/tr>\n
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