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q123查看全部
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math.round四舍五入
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<html> ????<head> ????<style> ????????div{ ????????width:200px; ????????height;200px ????????background-color:red; ????????opacity:.3; ????????} ????</style> ????</head> ????<body> ????<div> ????</div> ???? ????<script> ????????var?adiv=document.querSelector("div"); ????????adiv.onmouseover=function(){ ????????????startMove(100); ????????} ?????????adiv.onmouseout=function(){ ????????????startMove(30); ????????} ????????var?time=null; ????????var?opacitys=30; ????????function?startMove(Itarge){ ????????????clearServeteval(time); ????????????var?adiv=document.querSeletor('div'); ????????????time=setInterval(function(){ ????????????????var?seep=0; ????????????????if(?opacitys>Itarget) ????????????????????seep=-10; ?????????????????else ?????????????????????seep=10; ????????????????if(opacitys==Itarge){ ????????????????clearSetInterval(time); ????????????????????} ????????????????????else{ ????????????????????opacitys+=seep; ????????????????????adiv.style.opacity=opactys/100; ????????????????????} ????????????},100) ????????} ???????? ????</script> ????</body> </html>查看全部 -
并沒有出現(xiàn)老師的小數(shù)閃爍情況，但是出現(xiàn)了多小數(shù)形式的current值，所以為了完善，避免復(fù)現(xiàn)BUG，還是使用了Math.round函數(shù)
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JS設(shè)置css值 XXX.style.xxx? ?獲取css值 XXX.offsetxxx
????比如 oDiv.style.left = oDiv.offsetLeft + 10 + 'px';
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Cartoon</title>
<style type="text/css">
body, div, span {
margin: 0;
padding: 0;
}
#div1 {
width: 200px;
height:200px;
background: red;
?filter:alpha(opacity=30);
opacity: 0.3;
}
</style>
</head>
<body>
<script type="text/javascript">
window.onload = function() {
var oDiv = document.getElementById("div1");
oDiv.onmouseover = function() {
starmove(100);
}
oDiv.onmouseout = function() {
starmove(30);
}
}
var timer = null;
var alpha = 30;
function move(iTarget) {
var alpha = document.getElementById("div1");
clearInterval(timer);
timer = setInterval(function() {
var speed = 0;
if(alpha < iTarget) {
speed = 10;
}
else {
speed = -10;
}
if(alpha == iTarget){
clearInterval(timer);
}
else{
alpha += speed;
oDiv.style.filter = 'alpha(opacity:'+alpha+')';
oDiv.style.opacity = alpha/100;
}
},40)
}
</script>
<div id="div1">
</div>
</body>
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