js 中键值对 数组长度获取方法

<script type="text/javascript">

 var   v   =   [

    {"CN " : "china "},

    {"US " : "usa "},

    {"UK " : "english "}

  ];



   alert(v.length);   // 获取数组长度

   alert(v[0]["CN "]);   //以键取值

   alert(v[1]["US "]);   //以键取值

   alert(v[2]["UK "]);   //以键取值

 </script>
1 list = { "UserName": "tonykan", "Password": "12345678" }

2 alert(list["UserName"]);

 

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