代码如下:
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<meta charset= "UTF-8" > <title>Insert title here</title> </head> <body> <div id= "content" ></div> <script> var el = document.createElement( "div" ); el.innerHTML = ' <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>titleValue</title> <meta name="description" content="It is a good way to learn science." /> <meta name="keywords" content="Symfony2,Redis,PHP" /> <meta name="author" content="CSDN.NET" /> <meta name="Copyright" content="CSDN.NET" /> </head> <body> hello</body> </html>' ; var descElements = el.getElementsByTagName( "head" ); document.getElementById( "content" ).innerHTML = descElements.length; </script> </body> </html> |
1、若将script放到head元素中,则加载脚本时,尚未加载div元素,此时会出现“document.getElementById(...) 为空或者不是对象”。
2、以上代码在chrome中正常支行,输出结果为5,但在IE中输出结果为0.
3、注意在js中定义数据不需要使用[],否则会出错。