Vue 报错TypeError: this.$set is not a function 的解决方法

报错场景:将APi中得到的response数据,用Vue$set()使数据动态响应

报错代码:

methods: {
  textTranslate: function (text, to) {
 
   $.ajax({
    url: 'http://openapi.youdao.com/api',
    type: 'post',
    dataType: 'jsonp',
    data: {
     q: text,
     appKey: this.appKey,
     salt: this.salt,
     from: this.from,
     to: to,
     sign: md5(this.appKey + text + this.salt + this.key)
    },
    success: function (data) {
     this.$set(this.$data, 'translatedText', data.translation[0])
    }
   })
  }
 }

报错原因:这里的this指向的不是VueModel,

解决方法1:在执行函数中定义指向Model的变量 let vm = this ,用该变量替代this

methods: {
  textTranslate: function (text, to) {
   let vm = this
   $.ajax({
    url: 'http://openapi.youdao.com/api',
    type: 'post',
    dataType: 'jsonp',
    data: {
     q: text,
     appKey: this.appKey,
     salt: this.salt,
     from: this.from,
     to: to,
     sign: md5(this.appKey + text + this.salt + this.key)
    },
    success: function (data) {
     vm.$set(vm.$data, 'translatedText', data.translation[0])
    }
   })
  }
 }

解决方法2:将。siccess改为箭头函数的写法,这样子箭头函数里的this其实是指向VueModel的,这样子用this看不会报错了

success: (data) => {
     this.$set(this.$data, 'translatedText', data.translation[0])
    }

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