JS无法从输入中获取价值 [英] JS doesn't get value from input

问题描述

问题是我无法获取密码字段的值-pso1的警报返回空值.
我没有在此代码中看到任何错误，所以我正在寻求帮助.

The problem is that I can't get value of my password fields - alert with pso1 returns null.
I don't see any error in this code so I'm asking for help.

<form class='container' onsubmit="return checkit()">
    <h1> Javascript </h1>
    Login <input type='text' id='log'><br>
    Password <input type='password' id='pso1'><br>
    Confirm passwordd <input type='password' id='pso2'><br>
    <button>Register</button>
</form>

<script type="text/javascript">
    var pso1=document.getElementById('pso1').value ; 
    var pso2=document.getElementById('pso2').value ;    
    alert(pso1);
    function checkit(){
        if(pso1=!pso2){ 
            return false;
            alert('Passwords are not the same.');
        }
        else{
            return true; 
            alert('work');
        }
    }

</script>   

</body>

推荐答案

在代码中，页面加载后立即设置pso1和ps02的值，然后更改它们的值.您将需要更新这些值，将它们声明为函数内的局部变量:

In your code you are setting the values of pso1 and ps02 once right after the page load before their values are changed. You will want to update these values instead, declared them as local variables inside your function:

function checkit(){
    var pso1=document.getElementById('pso1').value; 
    var pso2=document.getElementById('pso2').value;   
    if(pso1=!pso2){ 
        return false;
        alert('Passwords are not the same.');
    }
    else{
        return true; alert('work');
    }
}

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