argb

摘要： php正则中，m修饰符主要是改变"^"、"$"的匹配范围，加m后可匹配换行符\n,不加则不能s修饰符主要改变"."的匹配范围,加s后可匹配换行符\n,不加则不能详细见http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php 阅读全文

摘要： 4.3.19Number valueprimitive value corresponding to a double-precision 64-bit binary format IEEE 754 valueNOTE A Number value is a member of the Number type and is a direct representation of a number.4.3.20Number typeset of all possible Number values including the special ―Not-a-Number‖ (NaN) values, 阅读全文

摘要： //检查用户输入，不符合规则不允许提交查询---bywangguan2012-03-26functioncheckInput(){varinput=document.getElementById('userlist');if(!input){returnfalse;}varuserlist=input.value,p=/^(?:[\u4E00-\u9FA5\w]+(?:,[\u4E00-\u9FA5\w]+)*)?$/g,//必须是以英文逗号分割的用户名，默认为用户名为字母数字下划线或中文，首尾不能为任何特殊符号m='';if((m=p.exec(userlis 阅读全文

摘要： html实体分为alpha entities(named entities)和numeric entities,php函数htmlspecialchars、htmlentities都只能转化为alpha entities，如果要转化为numeric entities要使用mb_encode_numericentity函数，如转化为GBK编码的numeric entities：$str="(王贯)'<";$convmap=array(0x0,0xffff,0,0xffff);$str=mb_encode_numericentity($str, $convmap, 阅读全文

摘要： The fundamental difference is that aSelectionrepresents the user's selection, whileRangerepresents a continuous part of a documentindependently of any visual representation. ASelectioncan (almost) be expressed in terms of zero, one or moreRanges but Ranges can also be created and modified comple 阅读全文

摘要： 1、通过document.createRange方法创建的Range无法正确执行createContextualFragment，需要document.getSelection().getRangeAt(0).createContextualFragment这样才行；2、document.createRange得到的range也无法直接insertNode进去一个documentFragment;比如f=range.createContextualFragment('<div>的解放路</div>');range.isertNode(f)会报错;3、se 阅读全文

摘要： In ECMAScript 5 (and some ECMAScript 3 implementations), reserved words may beused as property names without quoting. In general, however, property names that arereserved words must be quoted in ECMAScript 3. In ECMAScript 5, a trailing commafollowing the last property in an object literal is ignore 阅读全文

摘要： 13.5.1 End-to-end and Hop-by-hop HeadersFor the purpose of defining the behavior of caches and non-caching proxies, we divide HTTP headers into twocategories:· End-to-end headers, which are transmitted to the ultimate recipient of a request or response. End-to-endheaders in responses MUST be st 阅读全文

摘要： 6.2.1 Objects As Associative ArraysWhen you use the . operator to accessa property of an object, however, the name of the property is expressed as an identifier.Identifiers must be typed literally into your JavaScript program; they are not a datatype,so they cannot be manipulated by the program.On t 阅读全文

摘要： 当页面上存在一个图片元素时如：<img src='xxxx' alt="" />,页面加载中ie7、8跟chrome下图片的onload事件非常奇怪，有后完全不触发，有时候触发后进行改变某些元素的操作，操作结果无效。并且随页面大小的不同情况时好时坏，甚至代码位置的不同而不同。火狐下一切正常。解决办法是再onload触发前改变图片src的值，也就是相当于图片开始时有个临时的占位图片，页面载入过程中用js换成实际需要的src，只要每次onload事件触发前src发生变化，则onload表现正常。 阅读全文