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(Currentstyle) Why JavaScript sometimes uses the style to not get the properties of a set CSS _javascript tips

Source: Internet
Author: User
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This is according to the 2nd Blue bar to start the effect, that is, 1th did not get foot.style.display== "none", but I defined the CSS
<style type= "Text/css" >
#top {width:100px; Background-color: #00CCFF; height:20px}
#foot {width:100px; Background-color: #CCCC00; height:50px; Display:none}
</style>
<script language= "JavaScript" >
<!--
function QA () {
if (foot.style.display== "None") {
foot.style.display= "Block";
else {
Foot.style.display= "None";}
}
-->
</script>
<body>
<div id= "Top" onclick= "QA ()" ></div>
<div id= "Foot" >
</body>

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