问题描述
大家好,我只是想要一些关于 vue 道具数据的解释.所以我将值从父组件传递给子组件.问题是当父数据发生数据更改/更新时,它不会在子组件中更新.
Hi everyone I just want some explanation about vue props data. So I'm passing value from parent component to child component. The thing is when parent data has data changes/update it's not updating in child component.
Vue.component('child-component', {
template: '<div class="child">{{val}}</div>',
props: ['testData'],
data: function () {
return {
val: this.testData
}
}
});
但是使用道具名称 {{testdata}} 它可以正确显示来自父级的数据
But using the props name {{testdata}} it's displaying the data from parent properly
Vue.component('child-component', {
template: '<div class="child">{{testData}}</div>',
props: ['testData'],
data: function () {
return {
val: this.testData
}
}
});
提前致谢
小提琴链接
推荐答案
最好用一个非常简单的例子来解释
This is best explained with a very simple example
let a = 'foo'
let b = a
a = 'bar'
console.info('a', a)
console.info('b', b)
当你分配...
val: this.testData
您在创建组件时设置了一次 val
的初始值.对 prop 的更改不会反映在 val
中,就像上面对 a
的更改不会反映在 b
中一样.
you're setting the initial value of val
once when the component is created. Changes to the prop will not be reflected in val
in the same way that changes to a
above are not reflected in b
.
参见 https://vuejs.org/v2/guide/components.html#One-Way-Data-Flow
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