要完成此效果需要两个步骤
第一步:把如下代码加入到区域中
<script LANGUAGE="JavaScript">
var text = "在输入栏随便写点东东!!!";
var total_length = 60;    // length of string+spaces
function doShoot(msg) {
    var status_message = "";
    var assembling = "";
    this.status = status_message;
    var index = 0;
    var location = 0, i;
    // now shoot one letter at a time
    for(i=0; i < msg.length; i++) {        // moves through the 
message
        for(j=total_length-status_message.length; j > -1;j--) {    
            // see how many spaces have to be added
            assembling = "";
            for(var k=0; k < j; k++)
                assembling += " ";
            assembling += msg.charAt(i);
            this.status=status_message +assembling;
        }
        status_message += assembling;
    }
}
</script>
第二步:把“onload="doShoot(text)"”加在标记里
例如: