javaScript 函数作用域和闭包

 1 //闭包 ，嵌套函数被导出到它所定义的作用域外时，以这种方法调用，叫做一个闭包 2 function outA() { 3     var x = 0; 4     function inA() { 5         x += 1; 6         console.log("inA:x=" + x); 7     } 8     return inA; 9 }10 var funa = outA();11 funa();12 funa();13 14 15 16 function outC(obj) {17     var x = 0;18     function inA() {19         x += 10;20         console.log("inA:x=" + x);21     }22     function inB() {23         x += 2;24         console.log("inB:x=" + x);25     }26     obj.funa = inA;27     obj.funb = inB;28 }29 var o = new Object();30 outC(o);31 o.funa();32 o.funb();

输出："inA:x=1" "inA:x=2" "inA:x=10" "inB:x=12"