时间:2021-07-01 10:21:17 帮助过:130人阅读
使用 Props 传递数据
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:
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:
<!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>', data: function() { return { mssage: 'boy' } } }); var vm = new Vue({ el: '#app1' }) </script> </body> </html>
正确写法:
<!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:
HTML
<div id="app1"> <child msg="hello!"></child> <child nihao="hello1!"></child> <child nisha="hello2!"></child> </div>
JS
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:
HTML
<div id="app1"> <child msg="hello!"></child> <child nihao="hello1!"></child> <child nisha="hello2!"></child> </div>
JS
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:
HTML
<div id="app1"> <child msg="hello!"></child> <child nihao="hello1!"></child> <child nisha="hello2!"></child> </div>
JS
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:
HTML
<div id="app1"> <child msg="hello!"></child> <child nihao="hello1!"></child> <child nisha="hello2!"></child> </div>
JS
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