Question

var arr=[1,2,3,4,5]; var arr1=[2,3,4,5] Arr

var arr=[1,2,3,4,5];
var arr1=[2,3,4,5]
Array.prototype.sum = function () {
var result=0;
for (var i = 0; i < this.length; i++) {
result+=this[i];

};
//return result;
}
alert(arr.sum())
alert(arr1.sum())

就这段，如果图片看不清的话我打出来了，怎么把数组里面的数字改成乘积运算，不论添加多少数组，都能求出乘积

Answer 1

var arr=[1,2,3,4];

function test()
{
var result="";
for(var i=0;i<arr.length;i++)
{
for(var n=i+1;n<i+3;n++)
{
for(var j=n+1;j<arr.length;j++)
{
result+=arr[i]+","+arr[n]+","+arr[j]+"\r\n";
}
}
}
return result;
}

alert(test());