js实现图片切换效果渐隐渐显

Admin | 2015-4-15 10:34:53 | 被阅次数 | 4775

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<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片渐隐渐显的切换效果</title>
<script type="text/javascript">
window.onload = function()
{
    var testDiv = document.getElementById('test');
    testDiv.style.opacity = 1.0;
    testDiv.onmouseover = show;
    testDiv.onmouseout = hide;
};
var interval1, interval2;
var show = function()
{
    if(interval2) {
         //这里是为了当鼠标在Div渐隐的过程中移到Div上图片立即慢慢重现
        clearInterval(interval2);
    }
    i = document.getElementById('test').style.opacity*100;
    interval1 = setInterval("showRound()",20);
};
var showRound = function()
{
    i++;
    var testDiv = document.getElementById('test');
    if(testDiv.style.opacity != 1.0) {
        testDiv.style.opacity = i/100;
    } else {
        if(interval1) {
            clearInterval(interval1);
        }
    }
}
var hide = function()
{
    if(interval1) {
         //这里是为了当鼠标在Div渐现的过程中从Div上移走图片立即慢慢消失
        clearInterval(interval1);
    }
    j = document.getElementById('test').style.opacity*100;
    interval2 = setInterval("hideRound()",20);
};
var hideRound = function()
{
    j--;
    var testDiv = document.getElementById('test');
    if(testDiv.style.opacity != 0.0) {
        testDiv.style.opacity = j/100;
    } else {
        if(interval2) {
            clearInterval(interval2);
        }
    }
};
</script>
</head>

<body>
<div id="test" style="width:300px; height:250px">
<iframe scrolling="no" width="300" height="250" frameborder="0" src="<span>http://hi.csdn.net/attachment/201111/15/0_1321345637630X.gif</span><a href="#"></a>"></iframe>
</div>
</body>