1、var s = "this is a string";
var t = "this is also a string";
s.test = 20;
2、var s = new String("this is a string");
var t = new String("this is also a string");
s.test = 20;
這兩種方式有何區別?
第一種方式定義的test為s、t以及將來的所用此種形式定義的字串定義了test.
第二種方式定義的test僅為s定義.