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>
这里写代码片
</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: