使用 props 传递数据
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组件实例的作用域是孤立的。这意味着不能并且不应该在子组件的模板内直接引用父组件的数据。可以使用 props 把数据传给子组件。
“prop” 是组件数据的一个字段,期望从父组件传下来。子组件需要显式地用 props 选项 声明 props:
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Vue.component( ‘child‘ , { // 声明 props props: [ ‘msg‘ ], // prop 可以用在模板内 // 可以用 `this.msg` 设置 template: ‘<span>{{ msg }}</span>‘ }) |
然后向它传入一个普通字符串:
<child msg="hello!"></child>
举例
错误写法:
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<!DOCTYPE html> < html lang = "en" > < head > < meta charset = "UTF-8" > < title >vue.js</ title > </ head > < body > < pre > //使用 props 传输资料予子组件 //props , data 重复名称会出现错误 </ pre > < div id = "app1" > < child mssage = "hello!" ></ child > </ div > < script > Vue.config.debug = true; Vue.component(‘child‘, { // declare the props props: [‘msg‘,‘nihao‘,‘nisha‘], // the prop can be used inside templates, and will also // be set as `this.msg` template: ‘< span >{{ msg }}{{nihao}}{{nisha}}</ span >‘, data: function() { return { mssage: ‘boy‘ } } }); var vm = new Vue({ el: ‘#app1‘ }) </ script > </ body > </ html > |
正确写法:
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<!DOCTYPE html> < html lang = "en" > < head > < script type = "text/javascript" src = "./vue.js" ></ script > < meta charset = "UTF-8" > < title >vue.js</ title > </ head > < body > < pre > //使用 props 传输资料予子组件 //props , data 重复名称会出现错误 </ pre > < div id = "app1" > < child mssage = "hello!" ></ child > </ div > < script > Vue.config.debug = true; Vue.component(‘child‘, { // declare the props props: [‘msg‘,‘nihao‘,‘nisha‘], // the prop can be used inside templates, and will also // be set as `this.msg` template: ‘< span >{{ msg }}{{nihao}}{{nisha}}</ span >‘ }); var vm = new Vue({ el: ‘#app1‘ }) </ script > </ body > </ html > |
props 传入多个数据(顺序问题)
第一种:
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< div id = "app1" > < child msg = "hello!" ></ child > < child nihao = "hello1!" ></ child > < child nisha = "hello2!" ></ child > </ div > |
JS
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Vue.config.debug = true ; Vue.component( ‘child‘ , { // declare the props props: [ ‘msg‘ , ‘nihao‘ , ‘nisha‘ ], // the prop can be used inside templates, and will also // be set as `this.msg` template: ‘<span>{{ msg }}{{nihao}}{{nisha}}</span>‘ , /*data: function() { return { msg: ‘boy‘ } }*/ }); var vm = new Vue({ el: ‘#app1‘ }) |
结果:hello! hello1! hello2!
第二种:
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< div id = "app1" > < child msg = "hello!" ></ child > < child nihao = "hello1!" ></ child > < child nisha = "hello2!" ></ child > </ div > |
JS
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Vue.config.debug = true ; Vue.component( ‘child‘ , { // declare the props props: [ ‘msg‘ , ‘nihao‘ , ‘nisha‘ ], // the prop can be used inside templates, and will also // be set as `this.msg` template: ‘<span>123{{ msg }}{{nihao}}{{nisha}}</span>‘ , /*data: function() { return { msg: ‘boy‘ } }*/ }); var vm = new Vue({ el: ‘#app1‘ }) |
结果:123hello! 123hello1! 123hello2!
第三种:
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< div id = "app1" > < child msg = "hello!" ></ child > < child nihao = "hello1!" ></ child > < child nisha = "hello2!" ></ child > </ div > |
JS
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Vue.config.debug = true ; Vue.component( ‘child‘ , { // declare the props props: [ ‘msg‘ , ‘nihao‘ , ‘nisha‘ ], // the prop can be used inside templates, and will also // be set as `this.msg` template: ‘<span>{{ msg }}{{nihao}}{{nisha}}123</span>‘ , /*data: function() { return { msg: ‘boy‘ } }*/ }); var vm = new Vue({ el: ‘#app1‘ }) |
结果:hello! 123 hello1! 123 hello2!123
第四种:
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< div id = "app1" > < child msg = "hello!" ></ child > < child nihao = "hello1!" ></ child > < child nisha = "hello2!" ></ child > </ div > |
JS
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Vue.config.debug = true ; Vue.component( ‘child‘ , { // declare the props props: [ ‘msg‘ , ‘nihao‘ , ‘nisha‘ ], // the prop can be used inside templates, and will also // be set as `this.msg` template: ‘<span>{{ msg }}123{{nihao}}{{nisha}}123</span>‘ , /*data: function() { return { msg: ‘boy‘ } }*/ }); var vm = new Vue({ el: ‘#app1‘ }) |
结果:hello! 123 123hello1! 123hello2!
结论:
在props 中传入多个数据是,如果在父组件的模板类添加其他元素或者字符会有:
1-在最前面加入—每个子组件渲染出来都会在其前面加上
2-在最后面加入—每个子组件渲染出来都会在其后面加上
3-在中间加入—他前面子组件后面加上,后面的子组件后面加上
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