js 實現滾動字幕


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="i2">歡迎馬老師到來,觀察做出指導。</div>
<input id="i1" style="width: 80px;" value="歡迎馬老師到來,觀察做出指導。" >
<script type="application/javascript">
    content = document.getElementById("i1").getAttribute("value")
    setInterval("gun()",1000)
    var i = 0
    function gun() {
        document.getElementById("i1").setAttribute("value",content.substring(i,i+6))
        i++
        if ( i == content.length - 6){
            i = 0
        }
    }
</script>
<script>
    setInterval("gun2()",500);
    function gun2() {
        var tag = document.getElementById('i2');
        var content = tag.innerText;
        f = content.charAt(0);
        l = content.substring(1,content.length);
        new_content = l + f;
        tag.innerText = new_content;
    }
</script>

</body>
</html>

  


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