Marquee首尾相连不间断移动开始完全显示

实现首尾相连的Marquee效果，并且在开始时完整显示内容。而不是从左边渐渐移动出来！

有时很需要类似效果！发布出来。

<html>
<title>模拟Marquee实现首尾想连的移动效果</title>
<head>
<style>
.col_kx { OVERFLOW: hidden; WIDTH: 700px }
</style>
</head>
<body>

<div id="header_demo" class="col_kx">
<table border="0" cellspacing="0" cellpadding="0">
    <tr>
        <td id="header_demo1" nowrap>
            
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        <td id="header_demo2" nowrap></td>
    </tr>
</table>
</div>
<script>

//滚动头条
//滚动效果
var header_demo = document.getElementById("header_demo");
var header_demo1 = document.getElementById("header_demo1");
var header_demo2 = document.getElementById("header_demo2");
var speed=20;    //数值越大滚动速度越慢
header_demo2.innerHTML = header_demo1.innerHTML;

//header_demo2.offsetWidth 总宽度
alert(header_demo2.offsetWidth +"-"+header_demo.scrollLeft);

function Marquee(){
    if(header_demo2.offsetWidth-header_demo.scrollLeft<=0)
        header_demo.scrollLeft-=header_demo1.offsetWidth
    else{
        header_demo.scrollLeft++
    }
}
var MyMar = setInterval(Marquee,speed);
header_demo.onmouseover = function(){clearInterval(MyMar)}
header_demo.onmouseout = function(){MyMar = setInterval(Marquee,speed)}
</script>

</body>
</html>

Marquee首尾相连不间断移动 开始完全显示

Marquee首尾相连不间断移动开始完全显示