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：
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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
>
|
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：
HTML
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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：
HTML
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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：
HTML
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5
|
<
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：
HTML
|
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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