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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>14.vue_set方法</title>
<script src="../js/vue.js"></script>
<style>
#root {
display: flex;
justify-content: space-evenly;
}
.conditiondv {
width: 200px;
height: 200px;
background-color: bisque;
}
[v-cloak] {
display: none;
}
</style>
</head>
<body>
<div id="root">
<div>
<span>对象动态添加属性</span>
<br />
<span
>this.$set(data.object,'prototypeName','prototypeValue')</span
>
<span
>Vue.set(data.object,'prototypeName','prototypeValue')</span
>
<ul>
<li v-for="(v,k) in student">
<span>key:{{k}}</span>----<span>value:{{v}}</span>
</li>
</ul>
<button @click="addPrototypeClick">add prototype</button>
</div>
<div>
<span>对象动态修改数组属性</span><br />
<span
>this.$set(data.object,'prototypeName','prototypeValue')</span
>
<ul>
<li v-for="(v,k) in student">
<span>key:{{k}}</span>----<span>value:{{v}}</span>
</li>
</ul>
<button @click="addHobbyClick">add prototype</button>
<br />
<button @click="changeHobbyClick">使用数组的变更方法</button>
<table border="1">
<thead>
<td>方法</td>
<td>使用</td>
<td>描述</td>
</thead>
<tbody>
<tr>
<td>push</td>
<td>
const length = arrayObj. push([item1 [item2 [. .
. [itemN ]]]])
</td>
<td>
将一个或多个新元素添加到数组结尾，并返回数组新长度
</td>
</tr>
<tr>
<td>pop</td>
<td>const obj = arrayObj.pop()</td>
<td>移除最后一个元素并返回该元素值</td>
</tr>
<tr>
<td>shift</td>
<td>const obj = arrayObj.shift()</td>
<td>
移除最前一个元素并返回该元素值，数组中元素自动前移
</td>
</tr>
<tr>
<td>unshift</td>
<td>
const length = arrayObj.unshift([item1 [item2 [.
. . [itemN ]]]])
</td>
<td>
将一个或多个新元素添加到数组开始，数组中的元素自动后移，返回数组新长度
</td>
</tr>
<tr>
<td>splice</td>
<td>
const deleteArr =
arrayObj.splice(deletePos,deleteCount,[newItem1,newItem2])
</td>
<td>
删除从指定位置deletePos开始的指定数量deleteCount的元素[并添加一个或多个新的元素]，数组形式返回所移除的元素
</td>
</tr>
<tr>
<td>sort</td>
<td>const sortArr = arrayObj.sort()</td>
<td>
反转元素（最前的排到最后、最后的排到最前），返回数组地址
</td>
</tr>
<tr>
<td>reverse</td>
<td>const reverseArr = arrayObj.reverse()</td>
<td>
反转元素（最前的排到最后、最后的排到最前），返回数组地址
</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
<script>
Vue.config.productionTip = false;
const vm = new Vue({
el: '#root',
data() {
return {
student: {
name: 'odinsam',
age: 20,
hobby: ['抽烟', '喝酒', '烫头']
}
};
},
methods: {
addPrototypeClick() {
console.log('function addPClick');
this.$set(this.student, 'sex', '男');
},
addHobbyClick() {
console.log('function addHobbyClick');
this.$set(
this.student.hobby,
this.student.hobby.length,
'学习-' + this.student.hobby.length
);
},
changeHobbyClick() {
console.log('function changeHobbyClick');
this.student.hobby.push(
'push new hobby-' + this.student.hobby.length
);
}
}
});
</script>
</html>
|
