3. 循环
2.0里面默认就可以添加重复数据
arr.forEach(function(item,index){
});
去掉了隐式一些变量
$index $key
之前:
v-for="(index,val) in array"
现在:
v-for="(val,index) in array"
4. 可以添加重复数据：track-by="id"
变成
<li v-for="(val,index) in list" :key="index">
:key="index"是为了提升循环性能
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue1.0.js"></script>
<script>
window.onload=function(){
new Vue({
el:‘#box‘,
data:{
list:[‘width‘,‘height‘,‘border‘]
},
methods:{
add(){
this.list.push(‘background‘);
}
}
});
};
</script>
</head>
<body>
<div id="box">
<input type="button" value="添加" @click="add">
<ul>
<li v-for="val in list" track-by="$index">
{{val}}
</li>
</ul>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue.js"></script>
<script>
window.onload=function(){
new Vue({
el:‘#box‘,
data:{
list:[‘width‘,‘height‘,‘border‘]
},
methods:{
add(){
this.list.push(‘background‘);
}
}
});
};
</script>
</head>
<body>
<div id="box">
<input type="button" value="添加" @click="add">
<ul>
<li v-for="(val,index) in list">
{{val}} {{index}}
</li>
</ul>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue.js"></script>
<script>
window.onload=function(){
new Vue({
el:‘#box‘,
data:{
list:{//json
a:‘apple‘,
b:‘banana‘,
c:‘cell‘
}
},
methods:{
}
});
};
</script>
</head>
<body>
<div id="box">
<input type="button" value="添加">
<ul>
<li v-for="(val,key) in list">
{{val}} {{key}}
</li>
</ul>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue.js"></script>
<script>
window.onload=function(){
new Vue({
el:‘#box‘,
data:{
list:[‘width‘,‘height‘,‘border‘]
},
methods:{
add(){
this.list.push(‘background‘);
}
}
});
};
</script>
</head>
<body>
<div id="box">
<input type="button" value="添加" @click="add">
<ul>
<li v-for="(val,index) in list" :key="index">
{{val}} {{index}}
</li>
</ul>
</div>
</body>
</html>
时间： 2024-08-25 02:11:13