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Let's look at a routine.
Copy codeThe Code is as follows:
<Script type = "text/javascript">
Var timer
Function stopMove (){
ClearInterval (timer)
}
Function startMove (){
Var div = document. getElementById ('OK ')
ClearInterval (timer)
Timer = setInterval (function (){
OK. style. width = OK. offsetWidth-1 + 'px '; // theoretically the width should be reduced, but the actual growth, the reason in the style sheet border attribute, remove to solve
}, 20)
}
</Script>
<Style type = "text/css">
* {Margin: 0; padding: 0}
Body {font-size: 14px; line-height: 24px; margin: 0px; padding: 0px ;}
# OK {width: 800px; height: 200px; background-color: darkgreen; border: 1px red solid ;}
</Style>
</Head>
<Body>
<Div id = "OK"> </div>
Pay attention to the notes. Why does this happen? It is actually caused by border, because OK. style. width specifies the div width, while offsetwidth refers to the actual width, including the border width. Therefore, the width value obtained from the formula on the right is actually one pixel larger than that on the left. The solution is to subtract three pixels each time to actually subtract one pixel. Or use parseInt (div. style. width) On the right side, but modify the div as follows:
Copy codeThe Code is as follows:
<Div id = "OK" style = "width: 200px:> </div>
Ultimate Solution: Use currentstyle or getcomputedstyle to obtain attributes.
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