2021-01-11
image.png
//更新商品價(jià)格和廣告費(fèi)
self.$set('goodsInfo', 'goods_price', goodObj.goods_price);
self.$set('goodsInfo', 'goods_advertise_price', goodObj.goods_advertise_price);
self.goodsInfo.goods_price = goodObj.goods_price;
self.goodsInfo.goods_advertise_price = goodObj.goods_advertise_price;
當(dāng)vue的data里邊聲明或者已經(jīng)賦值過(guò)的對(duì)象或者數(shù)組（數(shù)組里邊的值是對(duì)象）時(shí)乎完，向?qū)ο笾刑砑有碌膶傩裕绻麓藢傩缘闹滴悦兀遣粫?huì)更新視圖的反惕。
<template>
<div id="app2">
<p v-for="item in items" :key="item.id">{{item.message}}</p>
<button class="btn" @click="handClick()">更改數(shù)據(jù)</button>
</div>
</template>
<script>
export default {
data() {
return {
items: [
{ message: "one", id: "1" },
{ message: "two", id: "2" },
{ message: "three", id: "3" }
]
};
},
mounted(){
this.items[0]={message:"測(cè)試",id:"4"}; //此時(shí)對(duì)象的值更改了宰衙，但是視圖沒(méi)有更新
this.$set(this.items,0,{message:"測(cè)試",id:"4"})旅薄； //$set可以觸發(fā)更新視圖
console.log(this.items)
},
methods: {
// 調(diào)用方法：Vue.set( target, key, value )
// target：要更改的數(shù)據(jù)源(可以是對(duì)象或者數(shù)組)
// key：要更改的具體數(shù)據(jù)
// value ：重新賦的值
handClick() {
//Vue methods中的this 指向的是Vue的實(shí)例搁进，這里可以直接在this中找到items
this.$set(this.items, 0, { message: "更改one的值", id: "0" });
},
}
};
</script>
<style>
</style>
