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>‘
})
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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 >
< 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 >
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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 >
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props 传入多个数据(顺序问题)
第一种:
HTML
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< div id = "app1" >
< child msg = "hello!" ></ child >
< child nihao = "hello1!" ></ child >
< child nisha = "hello2!" ></ child >
</ div >
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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‘
})
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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 >
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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‘
})
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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 >
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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‘
})
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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 >
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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‘
})
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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
时间: 2024-11-05 20:29:51