首先引用文件

<link href="Css/xiniu.css" rel="stylesheet" type="text/css">
<script src="jquery.min.js" type="text/javascript"></script>

核心jquery代码如下：

function Tough() {
            $('#pwdLevel_1').attr('class', 'ywz_zhuce_hongxian');
            $('#pwdLevel_2').attr('class', 'ywz_zhuce_hongxian2');
            $('#pwdLevel_3').attr('class', 'ywz_zhuce_hongxian3');
        }
        function checkPassword(pwdinput) {
            var maths, smalls, bigs, corps, cat, num;
            var str = $(pwdinput).val()
            var len = str.length;

            var cat = /.{16}/g
            if (len == 0) return 1;
            if (len > 16) { $(pwdinput).val(str.match(cat)[0]); }
            cat = /.*[\u4e00-\u9fa5]+.*$/
            if (cat.test(str)) {
                return -1;
            }
            cat = /\d/;
            var maths = cat.test(str);
            cat = /[a-z]/;
            var smalls = cat.test(str);
            cat = /[A-Z]/;
            var bigs = cat.test(str);
            var corps = corpses(pwdinput);
            var num = maths + smalls + bigs + corps;

            if (len < 6) { return 1; }

            if (len >= 6 && len <= 8) {
                if (num == 1) return 1;
                if (num == 2 || num == 3) return 2;
                if (num == 4) return 3;
            }

            if (len > 8 && len <= 11) {
                if (num == 1) return 2;
                if (num == 2) return 3;
                if (num == 3) return 4;
                if (num == 4) return 5;
            }

            if (len > 11) {
                if (num == 1) return 3;
                if (num == 2) return 4;
                if (num > 2) return 5;
            }
        }

        function corpses(pwdinput) {
            var cat = /./g
            var str = $(pwdinput).val();
            var sz = str.match(cat)
            for (var i = 0; i < sz.length; i++) {
                cat = /\d/;
                maths_01 = cat.test(sz[i]);
                cat = /[a-z]/;
                smalls_01 = cat.test(sz[i]);
                cat = /[A-Z]/;
                bigs_01 = cat.test(sz[i]);
                if (!maths_01 && !smalls_01 && !bigs_01) { return true; }
            }
            return false;
        }