prototype用法总结

function classA(a,b,c){if(a)this.a = a;if(b)this.b = b;if(c)this.c = c;this.reset = function(){for(var each in this){delete this[each];}}}classA.prototype.a = 10;classA.prototype.b = 20;classA.prototype.c = 30;var a = new classA();alert(a.a);a.a *=2;a.b *=2;a.c *=2;alert(a.a);alert(a.b);alert(a.c);a.reset();alert(a.a);alert(a.b);alert(a.c);})