JS Implementation key Value form

Way One
Java code

2. var hashMap = {};
4.       
6. hashmap[' key1 '] = ' value1 ';
8. hashmap[' Key2 '] = ' value2 ';
10. hashmap[' Key3 '] = ' value3 ';
12. hashmap[' Key4 '] = ' value4 ';
14. hashmap[' key5 '] = ' value5 ';
16. hashmap[' Key6 '] = ' value6 ';
18.       
20. if( ' Key2 ' in hashMap)
22.     {  
24. alert (' existance ');
26.     }  
28.       
30. For (value in HashMap)
32.     {  
34. alert (value);
36.     }  

Mode 2

JS Code

2. var hashMap = {
4. Set: function(key,value) {this[key] = value},
6. Get: function(key) {return this[key]},
8. Contains: function(key) {return this. Get (key) = = null? false : true },     
10. Remove: function(key) {delete this[key]}
12. }
    
14. ///////////

16.  such as var key = "Name"; var = "AAA"; var o = {key:value;} In this case, get the result is {key: "AAA"}, I want the result is {name: "AAA"}, should be how to write 

     In my project key is indeterminate, Can only use the variable 1 floor your wrong, I want {name: "AAA"} This result 

    var key = "Name"; var val = "aaa"; var o = {};str = "O." +key+ "= '" +val+ "'"; eval (str); alert (o.name); 

     &NBSP in Object, by assigning a value     var obj = new  object ();
    Obj[key] After the  = value;  is assigned, all of the values can be traversed through for  (var key in obj).
    
    But no value is obtained directly through Obj[key].    such as  var  key=  ' AAA '; obj[key]  but not value    why is this?