仅供参考
function strLenCalc(obj, checklen, maxlen) {
var v = obj.val(), charlen = 0, maxlen = !maxlen ? 2000 : maxlen, curlen = maxlen, len = v.length
if(v !='')
$('#sub').trigger('click')
for(var i = 0i <v.lengthi++) {
if(v.charCodeAt(i) <0 || v.charCodeAt(i) >255) {
curlen -= 1
}
}
if(curlen >= len) {
$("#"+checklen).html("还可输入 <strong class=\"lans\">"+Math.floor((curlen-len)/2)+"</strong>个字").css('color', '')
$("#subBtn").removeAttr("disabled")
} else {
$("#"+checklen).html("已经超过 <strong class=\"lans\">"+Math.ceil((len-curlen)/2)+"</strong>个字").css('color', '#FF0000')
$("#subBtn").attr("disabled", "disabled")
}
}
简单改了下你的，效果实现了，规范的写法自己改改吧
<!DOCTYPE html><html>
<head>
<meta charset="UTF-8"/>
<title>checkValidity 示例</title>
<style>
input.dd::-webkit-input-placeholder{
color: red
opacity:1
}
</style>
</head>
<body>
<form action="" method="get">
<table width="200%" border="0" cellspacing="0" cellpadding="0" >
<tr>
<td><input class='' id='id' name="uname" type="text" placeholder="ID" onblur="aa(this)"></td>
</tr>
<tr>
<td><input name="pwd" type="password" placeholder="密码"></td>
</tr>
<tr>
<td><input name="" type="submit"></td>
</tr>
</table>
</form>
<script>
function aa(a){
if(a.value==''){
a.placeholder='ID不能为空'
a.className="dd"
}
}
</script>
</body>
</html>
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