函数的声明
//常规function box1(n1, n2) {return n1 &＃43; n2;}console.log(box1(1, 2));//变量方式var box2 &＃61; function(n1, n2) {return n1 &＃43; n2;}console.log(box2(1, 2));//构造方式var box3 &＃61; new Function(&＃39;n1&＃39;, &＃39;n2&＃39;, &＃39;return n1&＃43;n2&＃39;);console.log(box3(1, 2))
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