wxml：
<button class="btn" bindtap="{{bindEndClick}}">{{phoneNum}}</button>
js：
Page({
data: {
phoneNum: '获取验证码',
bindEndClick:'clickEnd'
},
clickEnd() {
var _this = this
var numberNum = 61
var setinter = setInterval(function() {
numberNum = numberNum - 1
if (_this.data.phoneNum == 0) {
_this.setData({
phoneNum: "重新获取"
})
clearInterval(setinter);
} else {
_this.setData({
phoneNum: numberNum,
bindEndClick:''
})
console.log("1")
}
}, 1000)
}
})
