java脚本函数getElementById（）的工作原理是什么 [英] what is the work of java script function getElementById()

问题描述

java脚本函数的工作是什么getElementById（）

what is the work of java script function getElementById()

推荐答案

http://msdn.microsoft.com/en-us/library/ms536437(v = vs.85）.aspx [ ^ ]

http://www.w3schools.com/jsref/met_doc_getelementbyid.asp [ ^ ]

<input id="btnok" type="button" value="button" />
<input id="Button1" type="button" value="button" />
<div id="div1" />
<div id="div2" />
<script type="text/javascript">
 
document.getElementById("btnok").value; //It works on only that element which match the id with "btnok" or you can say      works on unique Id.


document.getElementsByTagName("div").length; //It works on all  that element which have the tag name "div"  
   
   </script>

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