关于 byval 与 byref 的区别分析总结_javascript技巧

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<script> <BR><!-- <BR>function Num(n){n=n*2;}//Number型的参数，按值传递的 ==> 相当于VBS中的ByVal; <BR>function Obj(){} <BR>Obj.prototype.show = function(o){ //JS对象，是按引用传递 ==> 相当于VBS中的ByRef <BR> o.toString = function(){ <BR> return("{id:"+this.id+",desc:"+this.desc+"}"); <BR> } <BR>} <BR>function Func(f){ //Function对象，是按引用传递 ==> 相当于VBS中的ByRef <BR> f.show = function(o){ <BR> o.toString = function(){ <BR> return("{id:"+this.id+",desc:"+this.desc+",toString:function(){} }"); <BR> } <BR> } <BR>} <br><br>var N; <BR>N=1; <BR>alert(N); <BR>Num(N); <BR>alert(N); <br><br>var O; <BR>O = { <BR> id:"001", <BR> desc:"编号说明", <BR> toString: function (){ <BR> return null; <BR> } <BR>}; <BR>var F = new Obj(); <BR>var F2 = new Obj(); <BR>alert(O.id+"\n"+O.toString()); <BR>F.show(O); <BR>alert(O.id+"\n"+O.toString()); <BR>Func(F); <BR>F.show(O); <BR>alert(O.id+"\n"+O.toString()); <BR>//--> <BR></script>