h5正则验证表单

正则验证表单
window.onload=function(){
    var user=document.getElementById("name");
    user.onblur=function(){
        if(user.value){
            user.setCustomValidity("");//现将有输入时的提示设置为空
        }else if(user.validity.valueMissing){
            user.setCustomValidity("用户名不能为空");
        }
        if(user.validity.patternMismatch){
            user.setCustomValidity("格式不正确，提示请输入字母，下划线，数字，6-12位");
        }
    };

    var btn=document.getElementById("btn");
    btn.onclick=function(){
        if(document.getElementById("password").value!=document.getElementById("password1").value){
            document.getElementById("password1").setCustomValidity("两次密码输入不一致");
        }else{
            document.getElementById("password1").setCustomValidity("");
        }
    }
};