Vuejs第十篇之vuejs父子组件通信

<div id="app"> 
父组件： 
<input v-model="val"><br/> 
子组件： 
<test :test="val"></test> 
</div> 
<script> 
var vm = new Vue({ 
el: '#app', 
data: { 
val: 1 
}, 
components: { 
test: { 
props: ['test'], 
template: "<input @keyup='findParent' v-model='test'/>", 
methods: { 
findParent: function () { 
console.log(this.$parent); //访问根组件 
console.log(this.$parent.val); //访问根组件的val属性 
console.log(this.$parent.$children.indexOf(this)); //查看当前能否在其父组件的子组件中找到索引 
console.log(this.$parent === this.$root); //查看父组件和根组件是不是全等的（因为他的父组件就是根组件） 
} 
} 
} 
} 
}); 
</script>

<div id="app"> 
父组件： 
<button @click="parentClick">点击向下传播broadcast</button> 
<br/> 
子组件1： 
<children1></children1> 
<br/> 
另一个子组件1： 
<another-children1></another-children1> 
</div> 
<script> 
var vm = new Vue({ 
el: '#app', 
data: { 
val: 1 
}, 
methods: { 
parentClick: function () { 
this.$broadcast("parentClick", "abc"); 
} 
}, 
events: { 
childrenClick: function () { 
console.log("childrenClick-Parent"); 
}, 
parentClick: function () { 
console.log("parentClick-Parent"); 
return true; 
} 
}, 
components: { 
children1: { //这个无返回值，不会继续派发 
props: ['test'], 
template: "<button>children1</button></br>子组件2：<children2></children2>", 
events: { 
childrenClick: function () { 
console.log("childrenClick-children1"); 
}, 
parentClick: function (msg) { 
console.log("parentClick-Children1"); 
console.log("message:" + msg); 
} 
}, 
components: { 
children2: { 
props: ['test'], 
template: "<button @click='findParent'>children-Click</button>", 
methods: { 
findParent: function () { 
this.$dispatch('childrenClick'); 
} 
}, 
events: { 
childrenClick: function () { 
console.log("childrenClick-children2"); 
}, 
parentClick: function (msg) { 
console.log("parentClick-Children2"); 
console.log("message:" + msg); 
} 
} 
} 
} 
}, 
anotherChildren1: { //这个是返回值为true，会继续向子组件的子组件派发 
props: ['test'], 
template: "<button>anotherChildren1</button></br>另一个子组件2：<another-children2></another-children2>", 
events: { 
childrenClick: function () { 
console.log("childrenClick-anotherChildren1"); 
return true; 
}, 
parentClick: function (msg) { 
console.log("parentClick-anotherChildren1"); 
console.log("message:" + msg); 
return true; 
} 
}, 
components: { 
anotherChildren2: { 
props: ['test'], 
template: "<button @click='findParent'>anotherChildren2-Click</button>", 
methods: { 
findParent: function () { 
this.$dispatch('childrenClick'); 
} 
}, 
events: { 
childrenClick: function () { 
console.log("childrenClick-anotherChildren2"); 
}, 
parentClick: function (msg) { 
console.log("parentClick-anotherChildren2"); 
console.log("message:" + msg); 
} 
} 
} 
} 
} 

} 
}); 
</script> 
}, 
parentClick: function () { 
console.log("parentClick-anotherChildren2"); 
} 
} 
} 
} 
} 

} 
}); 
</script> 

<div id="app"> 
父组件： 
<button>点击向下传播broadcast</button> 
<br/> 
子组件1： 
<!--绑定写在这里，可以多个绑定同一个，或者不同绑定不同的，但不能一个绑定多个--> 
<children v-on:test="parent" @test2="another"></children> 
</div> 
<script> 
var vm = new Vue({ 
el: '#app', 
data: { 
val: 1 
}, 
methods: { 
parent: function (arg) { 
console.log(arg); 
console.log("the first method with test event"); 
}, 
another: function () { 
console.log("another method"); 
} 
}, 
components: { 
children: { //这个无返回值，不会继续派发 
props: ['test'], 
template: "<button @click='childClick'>children1</button></br><button @click='childClick2'>children1</button>", 
methods: { 
childClick: function () { 
this.$emit("test", 'the argument for dispatch'); 
}, 
childClick2: function () { 
this.$emit("test2"); 
} 
}, 
events: { 
test: function () { 
console.log("test"); 
}, 
test2: function () { 
console.log("test2"); 
} 
} 
} 
} 
}); 
</script>

<div id="app"> 
父组件： 
<button @click="todo">触发子组件的事件</button> 
<br/> 
子组件1： 
<!--绑定写在这里，可以多个绑定同一个，或者不同绑定不同的，但不能一个绑定多个--> 
<children v-ref:child></children> 
</div> 
<script> 
var vm = new Vue({ 
el: '#app', 
methods: { 
todo: function () { 
this.$refs.child.fromParent(); //通过索引调用子组件的fromParent方法 
} 
}, 
components: { 
children: { //这个无返回值，不会继续派发 
props: ['test'], 
template: "<button>children1</button>", 
methods: { 
fromParent: function () { 
console.log("happened fromParent by ref"); 
} 
} 
} 
} 
}); 
</script>