表单验证

<script type="text/javascript">
//非空验证
var txt = document.getElementById("a");
txt.onblur = function(){
    if(txt.value==""){
        alert("不能为空");
        }

    }
</script>

//相等验证
var z = document.getElementById("mima2");
z.onblur=function(){
    var z1 = document.getElementById("mima1");
    if(z1.value==z.value){
        alert("密码通过");
        }else{
            alert("两次密码不一致");}
    }