TypeError: Cannot read property ‘push‘ of undefined

问题原因​​this​​​没有指向​​data​​​，出现​​this​​​作用域问题(解决方法，在函数外层​​const that = this​​​，利用​​that​​​代替​​this​​)

原代码：

报错

​​[system] TypeError: Cannot read property 'push' of undefined at Function.success (pages-index-index.9f60a9e14becec7424f4.hot-update.js:59) at chunk-vendors.js:186 at Object.I [as callback] (chunk-vendors.js:186) at b (chunk-vendors.js:186) at XMLHttpRequest.k.onload (chunk-vendors.js:186)​​

验证：

（打印this 值）

got(){
        uni.request({
          url:'http://api.tianapi.com/txapi/caipu/index?key=905c6456ae5c3c2bc0568f0b9d78815b&word='+this.name,
          method:'GET',
          data:{},
          success: function(res) {
              console.log(this)
            console.log(res.data.newslist[0]);
            // let cooks = res.data.newslist;
            this.cook.push(res.data.newslist[0]);
          }
        }
        )
      }

显示结果如下，可知this指向了我们的回调函数success

ƒ success(res) {
          __f__("log", this, " at pages/index/index.vue:48");
          __f__("log", res.data.newslist[0], " at pages/index/index.vue:49");
          // let cooks = res.data.newslist;
… " at pages/index/index.vue:48"

利用外层​​const that = this​​​ ,用​​tha​​​t代替内层的​​this​​可以解决域问题

got(){
        const that = this;
        uni.request({
          url:'http://api.tianapi.com/txapi/caipu/index?key=905c6456ae5c3c2bc0568f0b9d78815b&word='+this.name,
          method:'GET',
          data:{},
          success: function(res) {
            console.log(res.data.newslist[0]);
            // let cooks = res.data.newslist;
            that.cook.push(res.data.newslist[0]);
          }
        }
        
        )
      }
    }
  }