This article mainly introduces the JS method of finding the sum of the starting item to the ending item of an array. This function is implemented based on the array extension function, and involves JavaScript's simple judgment, traversal and other related operation skills for arrays. Friends who need it can Refer to the following
The example of this article describes the JS method of finding the sum of the starting item to the ending item of an array. Share it with everyone for your reference, the details are as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS求数组之和</title>
</head>
<body>
<script >
Array.prototype.sum= function(l,r){
l=l==undefined ? 0 : l;
r=r==undefined ? this.length - 1 : r;
var s = 0;
for(var i = l;i <= r;i++){s+=this[i];}
return s;
}
var ar = new Array(1,3,4,-1,-2,3,4,-2,4);
console.log(ar.sum(0,2))
</script>
</body>
</html>The operation effect diagram is as follows:
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