報錯場景:將APi中得到的response數據,用Vue$set()使數據動態響應
報錯代碼:
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])
}
})
}
}
報錯原因:這裏的this指向的不是VueModel,
解決方法1:在執行函數中定義指向Model的變量 let vm = this ,用該變量替代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.$data, 'translatedText', data.translation[0])
}
})
}
}
解決方法2:將。siccess改爲箭頭函數的寫法,這樣子箭頭函數裏的this其實是指向VueModel的,這樣子用this看不會報錯了
success: (data) => {
this.$set(this.$data, 'translatedText', data.translation[0])
}