innerHTM实现失焦判断方法
<script>
function validate()
{
document.getElementById("udiv").innerHTML="";
document.getElementById("pdiv").innerHTML="";
document.getElementById("adiv").innerHTML="";
var isok = true;
if(document.getElementById("userName").value=="")
{
document.getElementById("udiv").innerHTML="用户名不能为空";
isok = false;
}
if(document.getElementById("passWord").value=="")
{
document.getElementById("pdiv").innerHTML="密码不能为空";
isok = false;
}
if(document.getElementById("passWord").value.length<6)
{
document.getElementById("pdiv").innerHTML="密码长度不应小于6位";
isok = false;
}
if(document.getElementById("age").value=="")
{
document.getElementById("adiv").innerHTML="年龄不能为空";
isok = false;
}
if(isNaN(document.getElementById("age").value))
{
document.getElementById("adiv").innerHTML="年龄必须为数字";
isok = false;
}
return isok;
}
</script>
<form action="2.html" name="frm" onsubmit="return validate()">
用户名：<input type="text" name="userName"><span id="udiv"></span><br>
密码：<input type="password" name="passWord"><span id="pdiv"></span><br>
年龄：<input type="text" name="age"><span id="adiv"></span><br>
<input type="submit" value="提 交">
</form>