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]) }