var data = {};
data['key'] = ['val1','val2'];  // store an Array at data.key
 
data.key[0]; // 'val1'

…或对象中的值的键…

var data = {};
data['key'] = {key1:'val1',key2:'val2'};  // store an Object at data.key 
 
data.key.key1;  // 'val1'