vue的ref和$refs使用

蔚落 2021-11-01 17:36 362阅读 0赞

### 1. 基本用法：在当前页面中获取dom元素 ###

<div id="app">
    		<button @click="getRef" ref="button">获取该节点</button>
    	</div>
    
    <script>
    	new Vue({ 
    	el:'#app',
    	methods:{ 
    		getRef(){ 
    			console.log(this.$refs.button)
    		}
    	}
    });
    </script>

### 2. 获取子组件中的data ###

<div id="app1">
    		<child @click.native="getChildData" ref="data"></child>
    	</div>
    
    <script>
    	Vue.component('child',{ 
    				data(){ 
    					return{ 
    						msg:'hello'
    					}
    				},
    				template:'<button>获取子组件中的data</button>'
    			})
    			new Vue({ 
    				el:'#app1',
    				methods:{ 
    					getChildData(){ 
    						console.log(this.$refs.data.msg)
    					}
    				}
    			});
    </script>

### 3. 获取子组件中的方法 ###

<div id="app2">
    		<button @click="getChildMethod">获取子组件中的方法</button>
    		<child-a ref="meth"></child-a>
    	</div>
    
    <script>
    	Vue.component('child-a',{ 
    				methods:{ 
    					method(){ 
    						console.log('调用成功')
    					}
    				},
    				template:'<div></div>'
    			})
    			new Vue({ 
    				el:'#app2',
    				methods:{ 
    					getChildMethod(){ 
    						this.$refs.meth.method()
    					}
    				}
    			});
    </script>

### 4. 子组件调用父组件的方法 ###

例一：

<div id="root">
        <counter ref="one" @change="handleChange"></counter>
        <counter ref="two" @change="handleChange"></counter>
        <div>{ { total}}</div>
    </div>
    
    <script>
    
        Vue.component('counter',{ 
            template: '<div @click="handleClick">{ { number }}</div>',
            data: function(){ 
                return { 
                    number: 0
                }
            },
            methods: { 
                handleClick: function () { 
                    this.number ++
                    this.$emit('change')
                }
            }
        })
    
        var vm =new Vue({ 
            el: "#root",
            data: { 
                total: 0
            },
            methods: { 
                handleChange: function () { 
                    this.total= this.$refs.one.number + this.$refs.two.number
                    console.log(this.$refs.one.number)
                    console.log(this.$refs.two.number)
                }
            }
        })

例二：

<div id="app3">
    		<child-b ref="hello" @refresh="getData"></child-b>
    		<button @click="getFatherMethod">按钮</button>
    	</div>
    
    <script>
    	Vue.component('child-b',{ 
    				methods:{ 
    					open(){ 
    						console.log("111")
    						this.$emit('refresh')
    					}
    				},
    				template:'<div></div>'
    			})
    			new Vue({ 
    				el:'#app3',
    				methods:{ 
    					getFatherMethod(){ 
    						this.$refs.hello.open()
    					},
    					getData(){ 
    						console.log('调用成功')
    					}
    				}
    			});
    </script>