利用js做一个密码强度判断

如何利用js做一个密码强度判断，下面web建站小编给大家介绍一下实现这个功能的js代码！

1、先做一个密码输入框和三个提示按钮（弱、中强）

2、js代码介绍

var text = document.getElementById("text") //密码输入框
var r = document.getElementById("ruo")     //弱密码提示
var z = document.getElementById("zhong")   //中密码提示
var q = document.getElementById("qiang")   //强密码提示
text.onkeyup = function() {
  var reg = [];
  reg[0] = /[^a-zA-Z0-9]/g //特殊
  reg[1] = /[a-zA-Z]/g //字母
  reg[2] = /[0-9]/g //数字
  var str = text.value;
  var len = str.length
  var sec = 0; //密码强度
  if (len >= 6) {
    for (var i = 0; i < reg.length; i++) {
      if (str.match(reg[i])) {
        sec++
      }
    }
  }
  if (sec == 0) {
    r.style.backgroundColor = "white"
    z.style.backgroundColor = "white"
    q.style.backgroundColor = "white"
  } else if (sec == 1) {
    r.style.backgroundColor = "red"
    z.style.backgroundColor = "white"
    q.style.backgroundColor = "white"
  } else if (sec == 2) {
    r.style.backgroundColor = "red"
    z.style.backgroundColor = "gold"
    q.style.backgroundColor = "white"
  } else if (sec == 3) {
    r.style.backgroundColor = "red"
    z.style.backgroundColor = "red"
    q.style.backgroundColor = "red"
  }
}