javascript 字符串滚动显示

<html>

    <head>

        <script type="text/javascript">

             var chars = "JavaScript 是世界上最流行的脚本语言。";

             var begin = 0;

             var scrollSize = 1;

             var isRun = false;

             function scrollChar() {

                 if (!isRun) {

                     charsClone = chars;

                     document.sForm.scroll.value = charsClone;

                 }

              //alert(document.sForm.scroll.textLength);

              if (chars.length < document.sForm.scroll.textLength) {

                  var index = document.sForm.scroll.textLength - chars.length;

                  for (i = 0; i < index; i++)

                      chars += " ";

              }

              var subChar = charsClone.substr(begin, scrollSize);

              charsClone = charsClone.substr(begin + scrollSize) + subChar;

              document.sForm.scroll.value = charsClone;

              setTimeout("scrollChar()", 500);

              isRun = true;

             }

        </script>

    </head>

    <body onload="scrollChar()">

        <form name="sForm">

          <input name="scroll"/>

      </form>

    </body>

</html>
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javascript 字符串滚动显示

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