1、
function a(){
var n = 0;
function inc() {
n++; // 获得了父函数的变量n
console.log(n);
}
inc();
inc();
}
a(); //调用a, 控制台输出1，再输出2
2、
function a(){
var n = 0;
this.inc = function () {
n++;
console.log(n);
};
}
var c = new a();
c.inc(); //输出1
c.inc(); //输出2
3、
function a(){
var n = 0;
function inc(){
n++;
console.log(n);
}
return inc;
}
var c = a();
c(); //控制台输出1
c(); //控制台输出2
4、(和3好像没什么区别
function a(){
var n = 0;
var inc = function() {
n++;
document.writeln(n);
}
return inc;
}
var c = new a();
c();
c();
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