html:

<input id="pwd1" type="password" placeholder="设置登录密码" class="in_input">

 
<input id="pwd2" type="password" onkeyup="validate()" placeholder="重复登录密码" class="in_input" >
 
js:
function validate() {
    var pwd1 = document.getElementById("pwd1").value;
    var pwd2 = document.getElementById("pwd2").value;
    // 对比两次输入的密码
    if(pwd1 == pwd2) {
        $('.loginbox_login').off().on('click',function(){
            console.log('密码一样,点击注册跳转');
        })
    }
    else {
        $('.loginbox_login').off().on('click',function(){
            alert('登录密码不一致,请重新输入!');
        })
    }
}