javascript定义类，并实例化的各类之间成员变量不干扰。
var foucs_a = { createNew: function(){ var cls = { id:'', cur:0, _init: function(id) { this.id = id; }, next: function() { alert(this.cur); this.cur++; } }; return cls; }};var fa = foucs_a.createNew();fa.next();fa.next();var fb = foucs_a.createNew();fb.next();fb.next();
