父子组件之间传递Function,在vue组件中callback的应用
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2023-12-26 17:25:45
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在用element,
'el-autocomplete’这个组件时我看到有一种cb的方法,又get到一点知识点,
平时使用中父子组件传参一般都是Object,Array,Boolean,String类型,如果想要传递Function,并且保证他们之间的通信如何做到呢?
- 法一、
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>父子组件传递Function</title>
</head>
<body>
<div id="app">
{{data}}
<vue-callback :callback-fun="returnFunction"/>
</div>
<script src="../asserts/js/vue.min.js"></script>
<script>
let app = new Vue({
el: '#app',
data() {
return {
data:'callback function'
}
},
components:{
'vue-callback':{
name: 'vue-callback',
template: `<div class="component" @click="broadCast('broadCast')">
点击我组件向父组件传递function,父组件处理后返回给子组件数据</div>`,
props:{
callbackFun:Function //通过props传递Function组件
},
methods: {
broadCast(str){
console.log("step1:"+str);
//调用callbackFun函数
this.callbackFun(str,(callback=>{
//callback接收到父组件传递的参数后,会执行此函数
console.log("step3:"+callback)
}))
}
}
}
},
methods: {
returnFunction(str,cb){
console.log("step2:"+"returnFunction")
cb('callback');//传递给子组件
}
}
});
//result
//step1:broadCast
//step2:returnFunction
//step3:callback
</script>
</body>
</html>
- 法二、
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<vue-callback @callback-fun="transFun"/>
</div>
<script src="../asserts/js/vue.min.js"></script>
<script>
let app = new Vue({
el:'#app',
components:{
'vue-callback':{
template:`<div><div @click="clickFun">点击我发生故事</div></div>`,
methods: {
clickFun(){
console.log('step1:$emit');
this.$emit("callback-fun",{
params:{
name:'jane'
},
callback(value, index, array) {
console.log(`step4: 回调执行函数`)
console.log(value());
}
})
}
}
}
},
methods:{
transFun(obj){
console.log("step2:")
console.log(obj);
console.log("step3:调用callback,传入参数");
obj.callback(
function () {
console.log("function");
return 'fun'
}
)
}
}
})
</script>
</body>
</html>
// step1:$emit
// step2:
// {params: {…}, callback: ƒ}
// step3:调用callback,传入参数
// step4: 回调执行函数
// function
// fun
</script>
</body>
</html>