Array类型

phpcoder_echo 2016-12-27

展开全文

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <title>Document</title>
</head>
<body>
   <script>
       //array类型
       /*var color = new Array();
       var colors = new Array(20);//创建一个长度20的数组
       var colorss = new Array("red","blue","green");
       //var colors=["red","blue","green"];
       console.log(colorss);
       console.log(colorss[0]);
       colorss[2]="black";//修改
       colorss[3]="gray";
       console.log(colorss);*/
       var colorss = new Array("red","blue","green");
       colorss.length=5;
       //alert(colorss[4]);//设置长度----undefined
       var colo=["red","blue"];
       colo[colo.length]="green";
       colo[colo.length]="black";//可以添加
       console.log(colo);
       //检测数组方式
       value=[];
       if(value instanceof Array){
           alert('yes');
       }
       if(Array.isArray(value)){

       }

   </script>
</body>
</html>