vue+element-ui密码正则表达式验证密码属于强中弱

checkStrong(sValue) {
var modes = 0;
if (sValue.length < 1) return modes;
if (/\d/.test(sValue)) modes++;
if (/[a-z]/.test(sValue)) modes++;
if (/[A-Z]/.test(sValue)) modes++;
if (/\W/.test(sValue)) modes++;
switch (modes) {
case 1:
return 1;
break;
case 2:
return 2;
break;
case 3:
case 4:
return sValue.length < 4 ? 3 : 4;
break;
}
return modes;
}