<script language=javascript>
function a123()
{
if(!document.getElementById("button1"))
{
alert("没有这个BUTTON");
}
}
</script>
<input name=button1 id=button1 type=button value="button">
<input name=button2 id=button2 type=button value="检测" onclick=a123()>
function a123()
{
if(!document.getElementById("button1"))
{
alert("没有这个BUTTON");
}
}
</script>
<input name=button1 id=button1 type=button value="button">
<input name=button2 id=button2 type=button value="检测" onclick=a123()>
解决方案 »
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