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#1 Created at ... [Delete] [Delete and Lock User]

'use strict';
 function product(arr) {
    arr.reduce (function(x, y) {
        return x * y;
});

 }
console.log(product([1,2,3,4]));

结果不对啊，代码看着没问题啊

#2 Created at ... [Delete] [Delete and Lock User]

这里需要return出来，执行这个product函数需要返回值

return arr.reduce (function(x, y) {
        return x * y;
});

#3 Created at ... [Delete] [Delete and Lock User]

没返回值啊