1. 判断表单元素是否存在(一)
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->if("periodPerMonth" in document.theForm)
{
return true;
}
else{
return false;
}
2. 判断页面元素是否存在
if(document.getElementById("XXX"))
{
//存在
}
3. 判断表单元素是否存在(二)
if(document.theForm.periodPerMonth)
{
//存在
}或
if(typeof(document.theForm.periodPerMonth)=="object")
{
//存在
}
4. 判断表单是否存在
if(document.theForm)
{
//存在
}
5.用Jquery写脚本
if ( $("#someID").length > 0 ) {
$("#someID").text("hi");
}
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