单引号的javascript验证

Question

我的注册表中有一个密码字段。 以下是用于JavaScript验证的代码。

if(document.getElementById('txtPassword').value == '' || document.getElementById('txtPassword').value == 'Password' ){
            alert("Please enter Password");
            document.getElementById('txtPassword').focus();
            return false;
        }


      else if (document.getElementById('txtPassword').value.length < 8)
       {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }


      else if ( (! document.getElementById('txtPassword').value.match(/[a-z]/) ) || (! document.getElementById('txtPassword').value.match(/[A-Z]/) ) ) {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }


      else if (!document.getElementById('txtPassword').value.match(/\d+/)) {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }

        else if (document.getElementById('txtPassword').length < 8)
       {
               alert('Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number');
               return false;
       }

我需要检查单引号。 如果用户在密码字段中输入单引号并点击输入，则会弹出错误“在此字段中避免单引号”。

怎么做？

Answer 1

else if (document.getElementById('txtPassword').value.indexOf("'") != -1) {
    alert("Avoid single quotes in this field");
    return false;
}

这是一个简单的测试用例。 如果创建html页面，请将其放在head标签中，然后在浏览器中将其打开，您会看到它起作用：

var value1 = "abc'def";
var value2 = "abcdef";
if(value1.indexOf("'") != -1)
    alert(value1 + " contains a '");
else
    alert(value1 + " does not contain a '");
if(value2.indexOf("'") != -1)
    alert(value2 + " contains a '");
else
    alert(value2 + " does not contain a '");

Answer 2

使用此正则表达式进行密码检查

^(?=.*\d)(?=.*[a-zA-Z]).{8,}

当前，您正在做很多验证检查，以避免仅在正则表达式上使用那些检查。

if (! /^(?=.*\d)(?=.*[a-zA-Z]).{8,}/.test(txtPass)) {
    flag = false;
}
else if(txtPass.indexOf("'") != -1) {
    flag = false;
}

if (!flag)
    alert("Please ensure your password has at least eight characters, a mix of upper and lowercase and at least one number");

请参考现场演示