字符串中的字符数

Question

       var a="password";

在任何变量中如何检查长度是否不小于6个字符而不是＆gt; 12

     $(a).len();?????

Answer 1

不需要jQuery。

if ((a.length < 6) || (a.length > 12)) { error .... }

MDC reference on string.length

MDC reference on the String object

Answer 2

if (a.length < 6 || a.length > 12) {
    alert('Invalid password. It must be between 6 and 12 characters long');
}