demo is here http://jsfiddle.net/mtcv824d/
<div id="app">
<div @click="change(0)">
{{arr[0]}}
</div>
</div>
new Vue({
el: "-sharpapp",
data: {
arr: [true, false, false]
},
methods: {
change: function(index){
alert(this.arr[index])
this.arr[index] = !this.arr[index]
alert(this.arr[index])
}
}
})method finds that the value has changed, but there is no change on the page. what is the reason?
the document is written:
due to the limitation of JavaScript, Vue cannot detect the array of the following changes:
when you set an item directly using the index, for example: vm.items [indexOfItem] = newValue
when you modify the length of the array, for example: vm.items.length = newLength
ide/list.html-sharp%E6%95%B0%E7%BB%84%E6%9B%B4%E6%96%B0%E6%A3%80%E6%B5%8B" rel=" nofollow noreferrer "> https://cn.vuejs.org/v2/guide.
you need to make a deep copy
//
this.arr[index] = JSON.parse(JSON.stringify(this.arr[index]))Vue.$set
function can be one of the following. If the array subscript is assigned directly, the vue cannot listen for data updates.
this.arr.splice(index, 1, !this.arr[index])
this.$set(this.arr, index, !this.arr[index])this.$set (this.arr,index,ture/false)
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