// 验证码倒计时var CountDown = function(options) {  // 初始化配置信息  options = options || {};  // DOM节点  if(typeof options.element === 'string') {    this.element = document.querySelector(options.element);  } else {    this.element = options.element;  }  // 触发事件类型  this.eventType = options.eventType || 'click'; //默认click事件触发  // 间隔时间  this.interval = options.interval || 60; //默认60s间隔  // 原有的文本  this.oldText = this.element.innerText;  // 开始  this.start = function() {    this.element.setAttribute('disabled', 'disabled');    this.timer = window.setInterval(function() {      if(!!this.interval) {        this.count();      } else {        this.end();      }    }.bind(this), 1000);  };  // 计算  this.count = function() {    this.element.innerText = '重新发送(' + this.interval + ')';    this.interval -= 1;  };  // 结束  this.end = function() {    if(!!this.timer) {      window.clearInterval(this.timer);      delete this.timer;    }    this.reset();  };  // 重置  this.reset = function() {    this.element.innerText = this.oldText;    this.element.removeAttribute('disabled');    this.interval = options.interval || 60;  };  // 绑定事件  this.element.addEventListener(this.eventType, this.start.bind(this), false);};

主要用于移动端