90 lines
1.4 KiB
Markdown
90 lines
1.4 KiB
Markdown
# 循环渲染
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### v-for 遍历数组
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语法:
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v-for="(item,index) in arr" :key="index"
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> arr是被渲染的数组,item是被迭代的数组元素的别名 , index 指代数组的索引值
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示例:
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```
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<div v-for="(item,index) in arr" :key="index">
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第{{index}} 个元素 值为{{item}}
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</div>
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变体:
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<div v-for="(i,j) in pics" :key="j">
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第{{j}} 个元素 值为{{i}}
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</div>
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```
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```
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var app = new Vue({
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el: '#app',
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data: {
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arr:['a','b','c','d','e']
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},
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})
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```
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效果如下:
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![image-20201222101315624](循环渲染.assets/image-20201222101315624.png)
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### v-for 遍历对象的属性
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语法:
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v-for="(item,index) in obj" :key="index"
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> obj 是要遍历的对象 item 指代的是对象的值 index 指代的是对象的键
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示例:
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```
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<div v-for="(item,index) in obj" :key="index">
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键为index 值为{{item}}
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</div>
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```
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```
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var app = new Vue({
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el: '#app',
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data: {
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obj: {
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title: 'How to do lists in Vue',
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author: 'Jane Doe',
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publishedAt: '2016-04-10'
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}
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},
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})
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```
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效果如下:
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![image-20201222110247849](循环渲染.assets/image-20201222110247849.png)
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### v-for 遍历范围值
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```
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<div>
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<span v-for="n in 10">{{ n }} </span>
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</div>
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```
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![image-20201222111007833](循环渲染.assets/image-20201222111007833.png)
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