<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form name="myform" action="2.html" method="get">
<textarea name="t" cols="100" rows="10" ></textarea>
<div id="s">
你還能輸入個字符
</div>
</form>
<script type="text/javascript">
myform.t.onkeyup=function()
{
var j=myform.t.value.length;
var x=100;
var y=100-j;
document.getElementById("s").innerHTML="你還能輸入"+y+"個字符";
console.log("你還能輸入"+y+"個字符");
myform.t.value=myform.t.value.substring(0,100);
}
</script>
</body>
</html>