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>