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(Currentstyle) Why does JavaScript sometimes fail to get the set CSS attribute with style?

Source: Internet
Author: User
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This is to press the blue strip of 2nd to start the effect, that is to say, 1st does not get foot. style. Display = "NONE", but I defined
<Style type = "text/CSS">
# Top {width: 100px; Background-color: #00 CCFF; 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>
</Head>
<Body>
<Div id = "TOP" onclick = "QA ()"> </div>
<Div id = "foot">
</Body>

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