{"rsdb":{"rid":"157981","subhead":"","postdate":"0","aid":"118465","fid":"54","uid":"1","topic":"1","content":"<p>\u5f15\u8a00<\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u6700\u8fd1\u7a81\u7136\u770b\u5230\u4e86\u6709\u5173\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u95ee\u9898\uff0c\u5927\u81f4\u610f\u601d\u5c31\u662f\u521d\u59cb\u72b6\u6001\u4e0b\u9875\u9762\u53ea\u52a0\u8f7d\u6d4f\u89c8\u5668\u53ef\u89c6\u533a\u57df\u7684\u56fe\u7247\uff0c\u5269\u4f59\u56fe\u7247\u5728\u5f53\u6d4f\u89c8\u5668\u53ef\u89c6\u533a\u57df\u6eda\u52a8\u5230\u5176\u4f4d\u7f6e\u65f6\u624d\u5f00\u59cb\u52a0\u8f7d\u3002\u8c8c\u4f3c\u73b0\u5728\u8bb8\u591a\u5927\u578b\u7f51\u7ad9\u90fd\u6709\u5b9e\u73b0\u61d2\u52a0\u8f7d\uff0c\u6240\u4ee5\u6211\u4fbf\u5c31\u6b64\u95ee\u9898\u601d\u8003\u4e86\u4e00\u4e0b\u3002\u9996\u5148\u7b2c\u4e00\u4e2a\u95ee\u9898\u662f\u6d4f\u89c8\u5668\u6ca1\u6709\u76f8\u5173\u7684 API \u65b9\u6cd5\u53ef\u4ee5\u68c0\u6d4b\u67d0\u4e2a\u5143\u7d20\u662f\u5426\u5728\u53ef\u89c6\u533a\u57df\uff0c\u90a3\u4e48\u5c31\u53ea\u80fd\u6211\u4eec\u4eba\u5de5\u8ba1\u7b97\uff0c\u6240\u4ee5\u8fd9\u91cc\u5c31\u6d89\u53ca\u5230\u4e86\u5143\u7d20\u957f\u5bbd\uff0c\u6eda\u52a8\u6761\u4f4d\u7f6e\u7684\u77e5\u8bc6\u3002\u672c\u6587\u6d89\u53ca\u7684\u5230\u7684\u77e5\u8bc6\u6709\u5143\u7d20\u957f\u5bbd&nbsp;clientWidth\/offsetWidth\/scrollWidth \u7684\u533a\u522b\u3001\u4ee5\u53ca clientTop\/offsetTop\/scrollTop \u7684\u533a\u522b\uff0c\u5e76\u7ed9\u4e86\u83b7\u53d6\u5143\u7d20\u5750\u6807\u7684\u6e90\u4ee3\u7801\u3002<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u901a\u5e38\u5927\u5bb6\u83b7\u53d6\u5143\u7d20\u7684\u957f\u5bbd\u7684\u65f6\u5019\u90fd\u4f1a\u4f7f\u7528\u4e00\u4e9b\u6846\u67b6\u5c01\u88c5\u597d\u7684\u65b9\u6cd5\uff0c\u6bd4\u5982 jQuery.prototype.width() \uff0c\u8fd9\u4e9b\u6846\u67b6\u4f7f\u7528\u8d77\u6765\u65b9\u4fbf\u5feb\u6377\uff0c\u4e0d\u8fc7\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u8fd8\u662f\u975e\u5e38\u591a\u7684\uff0c\u5173\u4e8e\u5143\u7d20\u7684\u957f\u5bbd\uff0c\u6709\u591a\u79cd\u7684\u83b7\u53d6\u65b9\u6cd5\uff0c\u5176\u4ee3\u8868\u7684\u5b9e\u9645\u610f\u4e49\u4e5f\u662f\u4e0d\u540c\u7684\u3002<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u7b80\u5355\u6765\u8bf4\u53ef\u4ee5\u4f7f\u7528\u4e0b\u5217\u516c\u5f0f\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000<strong><span style=\"color: #ff0000;\">clientWidth = width(\u53ef\u89c6\u533a) + padding<\/span><\/strong><\/span><\/p><br\/><p><strong><span style=\"color: #ff0000;\">\u3000\u3000offsetWidth = width(\u53ef\u89c6\u533a) + padding + border<\/span><\/strong><\/p><br\/><p><strong><span style=\"color: #000000;\"><span style=\"color: #ff0000;\">\u3000\u3000scrollWidth = width(\u5185\u5bb9\u533a)<\/span>\u3000<\/span><\/strong><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u5047\u8bbe\u6709\u6211\u4eec\u4ee5\u4e0b\u4e00\u4e2a\u5143\u7d20\uff1a<\/span><\/p><br\/><p>&nbsp;\u3000\u3000<span style=\"color: #000000;\">\u4ee5\u4e0a DEMO \u662f\u5e38\u89c4\u60c5\u51b5\u4e0b\u7684\u533a\u522b\uff0c\u4e0b\u9762\u52a0\u4e0a\u4e00\u4e2a\u6eda\u52a8\u6761\u6211\u4eec\u4eec\u518d\u6765\u89c2\u5bdf\u4ee5\u4e0b\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u6211\u4eec\u4f7f\u7528\u4ee5\u4e0b\u516c\u5f0f\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000<strong><span style=\"color: #ff0000;\">clientTop = border<\/span><\/strong><\/span><\/p><br\/><p><strong><span style=\"color: #ff0000;\">\u3000\u3000offsetTop = \u5143\u7d20\u8fb9\u6846\u5916\u56f4\u81f3\u7236\u5143\u7d20\u8fb9\u6846\u5185\u56f4<\/span><\/strong><\/p><br\/><p><strong><span style=\"color: #ff0000;\">\u3000\u3000scrollTop = \u5143\u7d20\u53ef\u89c6\u533a\u57df\u9876\u90e8\u81f3\u5b9e\u9645\u5185\u5bb9\u533a\u57df\u7684\u9876\u90e8<\/span><\/strong><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u7ed9\u5b9a\u4ee5\u4e0b\u4e24\u4e2a\u5143\u7d20 container \u548c test<\/span><\/p><br\/><p><span style=\"color: #000000;\">&nbsp;\u3000\u3000\u6709\u4e86\u4ee5\u4e0a\u77e5\u8bc6\u57fa\u7840\u4e4b\u540e\uff0c\u6211\u4eec\u73b0\u5728\u9700\u8981\u8003\u8651\u7684\u95ee\u9898\u662f\uff0c\u5982\u4f55\u83b7\u53d6\u9875\u9762\u5143\u7d20\u7684\u7edd\u5bf9\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662f\u5728\u6587\u6863\u6d41\u5185\u5bb9\u533a\u7684\u4f4d\u7f6e\u3002\u6211\u4eec\u77e5\u9053\uff0c\u5143\u7d20\u7684 offsetTop \u5c5e\u6027\u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u5143\u7d20\u8fb9\u6846\u5916\u56f4\u81f3\u7236\u5143\u7d20\u8fb9\u6846\u5185\u56f4\u7684\u7684\u8ddd\u79bb\uff0cclientTop \u53ef\u4ee5\u83b7\u53d6\u5143\u7d20\u8fb9\u6846\u7684\u5bbd\u5ea6\u3002\u90a3\u4e48\u73b0\u5728\u7528\u4e00\u4e2a\u9012\u5f52\u7684\u516c\u5f0f\u5c31\u53ef\u4ee5\u6c42\u5f97\u5f53\u524d\u5143\u7d20\u5728\u9875\u9762\u4e2d\u7684\u7edd\u5bf9\u4f4d\u7f6e\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000<strong><span style=\"color: #ff0000;\">Element.absoluteTop = Element.parent.absoluteTop + Element.offsetTop + Element.clientTop;<\/span><\/strong><\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u540c\u7406\uff0c\u6211\u4eec\u7528\u53c2\u7167\u5143\u7d20\u7684\u957f\u5bbd\u51cf\u53bb left \u548c top \u548c\u5b9a\u4f4d\uff0c\u5373\u53ef\u5f97\u5230 right \u548c bottom \u7684\u5b9a\u4f4d\uff1b<\/span><\/p><br\/><p><span style=\"color: #000000;\">&nbsp;\u3000\u3000\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4ee5\u4e0b\u5de5\u5177\u6765\u83b7\u53d6\u5143\u7d20\u7684\u7edd\u5bf9\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662f\u5728\u5185\u5bb9\u533a\u7684\u5b9a\u4f4d\uff08\u53c2\u7167\u5143\u7d20\u5fc5\u987b\u662f\u76ee\u6807\u5143\u7d20\u7684\u7956\u5148\u5143\u7d20\uff09\uff1a<\/span><\/p><br\/><p>\u3000\u3000\u6b64\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u4e00\u4e2a\u5143\u7d20\u76f8\u5bf9\u4e8e\u4e00\u4e2a\u7236\u5143\u7d20\u7684\u5b9a\u4f4d\uff0c\u5982\u679c\u8981\u83b7\u53d6\u5143\u7d20\u5728\u6574\u5f20\u9875\u9762\uff0c\u76f4\u63a5\u4f20\u5165 document \u5373\u53ef\uff1a<\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u5728\u4e0a\u4e00\u5c0f\u8282\u4e2d\uff0c\u6211\u4eec\u5c01\u88c5\u4e86\u4e00\u4e2a\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u4e00\u4e2a\u5143\u7d20\u7684\u76f8\u5bf9\u4e8e\u4e00\u4e2a\u7956\u5148\u5143\u7d20\u7684\u7edd\u5bf9\u5b9a\u4f4d\u5750\u6807\uff0c\u5728\u8fd9\u4e00\u5c0f\u8282\u4e2d\uff0c\u6211\u4eec\u6765\u83b7\u53d6\u5143\u7d20\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u53ef\u89c6\u533a\u57df\u7684\u5b9a\u4f4d\u5750\u6807\u3002\u5728\u4e0a\u4e00\u4e2a\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u53d6\u4e00\u4e2a\u5143\u7d20\u5728 document \u5f53\u4e2d\u7684\u5b9a\u4f4d\uff0c\u8fd8\u8bb0\u5f97\u6211\u4eec\u5728\u7b2c\u4e8c\u5c0f\u8282\u4e2d\u7684 scrollTop \u5c5e\u6027\u5417\uff1f\u8be5\u5c5e\u6027\u53ef\u4ee5\u83b7\u53d6\u6eda\u52a8\u7a97\u53e3\u53ef\u89c6\u533a\u57df\u9876\u7aef\u8ddd\u79bb\u5185\u5bb9\u533a\u9876\u7aef\u7684\u8ddd\u79bb\uff0c\u6211\u4eec\u7528\u5143\u7d20\u7684\u7edd\u5bf9\u5b9a\u4f4d\u5750\u6807\u51cf\u53bb document \u7684\u6eda\u52a8\u5b9a\u4f4d\u5c31\u662f\u6211\u4eec\u60f3\u8981\u7684\u6d4f\u89c8\u5668\u7a97\u53e3\u5b9a\u4f4d\u5566\uff08\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u5de6\u4e0a\u89d2\uff09\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000<strong><span style=\"color: #ff0000;\">ViewportTop =&nbsp;Element.absoluteTop - document.body.scrollTop;<\/span><\/strong><\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u4e00\u4e2a\u517c\u5bb9\u6027\u7684\u95ee\u9898\uff0c\u5728 Chrome \u4e2d\u53ef\u4ee5\u7528&nbsp;document.body.scrollTop \u548c window.pageYOffset\uff0cIE 7\/8 \u53ea\u80fd\u901a\u8fc7 document.documentElement.scrollTop \u83b7\u53d6\uff0c FireFox \u548c IE9+ \u53ef\u4ee5\u7528&nbsp;document.documentElement.scrollTop \u548c window.pageYOffset \u83b7\u53d6\uff0cSafari \u9700\u8981 window.pageYOffset \u83b7\u53d6\u3002\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u505a\u4e00\u4e0b\u6d4f\u89c8\u5668\u517c\u5bb9\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000<strong><span style=\"color: #ff0000;\">scrollTop = window.pageYOffset ||&nbsp;document.documentElement.scrollTop ||&nbsp;document.body.scrollTop;<\/span><\/strong><\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u6211\u4eec\u5728\u521a\u624d\u7684\u5de5\u5177\u4e0a\u6dfb\u52a0\u4e00\u4e2a\u65b9\u6cd5\uff1a<\/span><\/p><br\/><p>\u3000\u3000<span style=\"color: #000000;\">\u901a\u8fc7 Position.getViewport \u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5143\u7d20\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u7684\u5b9a\u4f4d\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u5728\u4e0a\u9762\u7684\u51e0\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u53d6\u5143\u7d20\u7684\u6587\u6863\u6d41\u5b9a\u4f4d\u548c\u89c6\u7a97\u5b9a\u4f4d\uff0c\u4e0d\u8fc7\u8fd9\u8fd8\u662f\u4e0d\u80fd\u5224\u65ad\u4e00\u4e2a\u5143\u7d20\u662f\u5426\u5728\u53ef\u89c6\u533a\u57df\u5185\uff0c\u56e0\u4e3a\u89c6\u7a97\u5b9a\u4f4d\u53ef\u4ee5\u662f\u975e\u5e38\u5927\u7684\u6570\u5b57\uff0c\u8fd9\u6837\u5143\u7d20\u5c31\u5728\u89c6\u7a97\u7684\u540e\u9762\u3002\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u4f7f\u7528\u6d4f\u89c8\u5668\u89c6\u7a97\u9ad8\u5ea6 window.innerHeight \u5c5e\u6027\uff0c\u5728 IE8 \u4ee5\u4e0b\u9700\u8981\u7528&nbsp;document.documentElement.clientHeight \u6765\u83b7\u53d6\u3002<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000<strong><span style=\"color: #ff0000;\">windowHeight =&nbsp;window.innerHeight ||&nbsp;document.documentElement.clientHeight;<\/span><\/strong><\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u73b0\u5728\uff0c\u6211\u4eec\u7528\u7a97\u53e3\u7684\u9ad8\u5ea6\uff0c\u51cf\u53bb\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u7684\u5b9a\u4f4d\uff0c\u5373\u53ef\u83b7\u53d6\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u53f3\u4e0b\u89d2\u7684\u5b9a\u4f4d\uff1b<\/span><\/p><br\/><p>\u3000\u3000<span style=\"color: #000000;\">\u73b0\u5728\u6211\u4eec\u4f7f\u7528 Position.getViewport(targetNode) \u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5143\u7d20<strong>\u5de6\u4e0a\u89d2<\/strong>\u76f8\u5bf9\u4e8e\u7a97\u53e34\u4e2a\u65b9\u5411\u7684\u5b9a\u4f4d\uff1a<\/span><\/p><br\/><p>\u3000\u3000<span style=\"color: #000000;\">\u6709\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u73b0\u5728\u5c31\u53ef\u4ee5\u771f\u6b63\u7684\u5224\u65ad\u5143\u7d20\u662f\u5426\u5728\u53ef\u89c6\u533a\u57df\u5185\u4e86\uff1a<\/span><\/p><br\/><p>\u3000\u3000<span style=\"color: #000000;\">\u5224\u65ad\u7406\u7531\u5f88\u7b80\u5355\uff0c\u5982\u679c\u6709\u4e00\u8fb9\u7684\u5b9a\u4f4d\u662f\u8d1f\u503c\uff0c\u90a3\u4e48\u5143\u7d20\u5c31\u4e0d\u5728\u89c6\u7a97\u5185\u3002<\/span><\/p><br\/><p>&nbsp;<\/p><br\/><p><span style=\"color: #000000;\">&nbsp;\u3000\u3000\u6d4f\u89c8\u5668\u517c\u5bb9\u6027\uff1a<\/span><\/p><br\/><p>\u3000\u3000<span style=\"color: #000000;\">IE7 \u4e5f\u53ef\u4ee5\u4f7f\u7528\uff0c\u4e0d\u8fc7\u7ed3\u679c\u53ef\u80fd\u4f1a\u6709\u4e00\u70b9\u5dee\u5f02\u3002<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u5728\u6587\u7ae0\u7684\u5f00\u59cb\uff0c\u6211\u4eec\u63d0\u5230\u8fc7\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u95ee\u9898\uff0c\u90a3\u4e48\u5177\u4f53\u9700\u8981\u600e\u4e48\u5b9e\u73b0\u5462\uff1f\u8fd9\u91cc\u53ea\u662f\u7ed9\u51fa\u4e00\u4e2a\u601d\u8def\uff1a<\/span><\/p><br\/><p><span style=\"color: #000000;\">\u3000\u3000\u521d\u59cb\u72b6\u6001\u4e0b\u4e0d\u8bbe\u7f6e img \u7684 src\uff0c\u5c06\u56fe\u7247\u7684\u771f\u5b9e&nbsp;url \u7f13\u5b58\u5728 Img \u6807\u7b7e\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u4e3a data-src \uff0c\u8fd9\u6837\u56fe\u7247\u5c31\u4e0d\u4f1a\u52a0\u8f7d\u4e86\uff0c\u968f\u540e\u7ed9\u9f20\u6807\u6dfb\u52a0 mousescroll \u4e8b\u60c5\uff0c\u6bcf\u6b21\u9f20\u6807\u6eda\u52a8\u7684\u65f6\u5019\u5c06\u8fdb\u5165\u53ef\u89c6\u533a\u57df\u7684\u56fe\u7247\u7684 src \u8fd8\u539f\uff0c\u8fd9\u6837\u4e5f\u5c31\u5b9e\u73b0\u4e86\u56fe\u7247\u61d2\u52a0\u8f7d\u6548\u679c\u3002\u4e0d\u8fc7\u521d\u59cb\u72b6\u6001\u4e0b\u9700\u8981\u5c06\u9875\u9762\u53ef\u89c6\u533a\u57df\u7684\u56fe\u7247\u5148\u52a0\u8f7d\u51fa\u6765\u3002<\/span><\/p><br\/>","orderid":"0","title":"JavaScript \u83b7\u53d6\u5143\u7d20\u7684\u5750\u6807\u8be6\u89e3","smalltitle":"","mid":"0","fname":"linux\u7f16\u7a0b\u57fa\u7840","special_id":"0","bak_id":"0","info":"0","hits":"388","pages":"1","comments":"0","posttime":"2017-07-13 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