<script>
function f(w) {
var max=1000;
var l = w.value.length;
document.getElementById("cnt").innerHTML = "最多" +max+ ",还有" +(max-l)+".";
}</script>
<textarea onkeyup="f(this)" onpaste="f(this)">
</textarea>
<div id="cnt"></div>
function f(w) {
var max=1000;
var l = w.value.length;
document.getElementById("cnt").innerHTML = "最多" +max+ ",还有" +(max-l)+".";
}</script>
<textarea onkeyup="f(this)" onpaste="f(this)">
</textarea>
<div id="cnt"></div>
看一下源码
编号:<input type="test" name="num" id=n value="">
<input type="submit" value="确定">
</FORM>
<TABLE width=10><tr><td id=r></td></tr></table>
<script>
document.getElementById("n").onkeyup = getNum;function getNum(){
document.getElementById("r").innerHTML = document.getElementById("n").value;
}
</script>
剩下的就是你对数组的判断和处理了