js 函数(小练)

function increaseNum(startNum) {
            var start = startNum;
            var inc = function() {
                start++;
                window.alert(start);
            }
            return inc;
        }
        var go = increaseNum(3);
        go();
        go();

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结果:4,5

 

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 function increaseNum(startNum) {
            this. start = startNum;
            this. inc = function() {
                this.start += 1
                window.alert(this.start);
            }
        }
        var go = new increaseNum(3);
        go.inc ();
        go.inc ();

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结果:4,5