var clock = '';
  var nums = 60;
  var btn;
  function sendCode(thisBtn) {
    btn = thisBtn;
    btn.disabled = true; //将按钮置为不可点击
    btn.value = nums + '秒重新获取';
    btn.className = 'regGetcodeBtn1';
    if (clickNumber == 0) {
      clock = setInterval(doLoop, 1000); //一秒执行一次
    }
  }

function doLoop() {
    nums--;
    if (nums > 0) {
      btn.value = nums + '秒后重新获取';
      clickNumber = 1;
    } else {
      clearInterval(clock); //清除js定时器
      btn.disabled = false;
      btn.value = '获取验证码';
      btn.className = 'regGetcodeBtn1 color';
      nums = 60; //重置时间
      clickNumber = 0;
    }
  }

$.ajax({
      url: servletUrl,
      type: "post",
      dataType: 'JSON',
      data: { name: name, securityCode: txtsecurityCode1/* strTelphone: strCodeTelphone, securityCode: txtsecurityCode1*/},
      success: function (result) {
        //已经存在该名字提示用户
        if (result.status == false) {
          console.log("传入ajax中的this对象：" + this.location);
          $('#hdVerifCode').val(0);
          nums = 0;
          layer.alert(result.msg, { icon: 2 });
          layer.close(loadingindex);
          // 刷新验证码
          $('#secImg').click();
        } else {
          $('#hdVerifCode').val(1);
          sendCode(this);
 
        }
      },

console.log(this) //window
 
//function声明函数
function bar () {console.log(this)}
bar() //window
 
//function声明函数赋给变量
var bar = function () {console.log(this)}
bar() //window
 
//自执行函数
(function () {console.log(this)})(); //window

//对象方法调用
var person = {
 run: function () {console.log(this)}
}
person.run() // person

//事件绑定
var btn = document.querySelector("button")
btn.onclick = function () {
 console.log(this) // btn
}
//事件监听
var btn = document.querySelector("button")
btn.addEventListener('click', function () {
 console.log(this) //btn
})//jqery中的ajax$.ajax(object)在ajax的succes中，this指向了传入ajax的对象objsuccess:function(){
      $(this).prevAll('p').css("text-decoration","line-through");
　　　　　　}.bind(this)//使用bind(this)绑定当前this事件

//不使用new指向window
function Person(name) {
 console.log(this) // window
 this.name = name;
}
Person('inwe')
//使用new
var people = new Person('iwen')
function Person(name) {
 this.name = name
 console.log(this) //people
 self = this
}
console.log(self === people) //true
//这里new改变了this指向，将this由window指向Person的实例对象people