//变量声明，方法一：假如 Object 未被扩展
var array = new Object();
//变量声明，方法二：假如 Object 已被扩展
var array;
//赋值，以上两种方法均可
array[‘something’] = ‘yay’;
array[‘somethingelse’] = ‘more’;
//循环
for ( var keyVar in array ) {
alert(array[keyVar]);
}
注意 var keyVar ，不加var 为全局全量，可能引起冲突
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