// = > 1、常规方法:
function sum(arg) {
var newary = [];
//类数组转换为数组
if (arg instanceof Array){
console.log("传参方式是数组");
for (var i = 0; i < arg.length; i++) {
newary.push(arg[i]);
}
}else {
console.log('传参方式是多个数字');
for (var i = 0; i < arguments.length; i++) {
newary.push(arguments[i]);
}
}
//数组从小到打排序
newary.sort(function (a,b) {
return a-b;
});
//删除数组开头的最小项
newary.shift();
//删除数组末尾最大项
newary.pop();
//循环求和
var result = 0;
for (var i = 0; i < newary.length; i++) {
result += newary[i];
}
//求平均数,并返回结果
return Math.round(result/newary.length);
}
var result1 = sum(156,423,90,5,24,66,450,25,4,86,76,64,5,88,63,33,42,34,46,19,48,35,70);
console.log(result1); // => 71.33333333333333
var arr = [1,2,3,4,5,6,7,8,9];
var result2 = sum(arr);
console.log(result2); // => 5
// = > 常规方法改进:1.0版
function sum(arg) {
//类数组转换为数组
if (arg instanceof Array) {
var newary = Array.prototype.slice.apply(arg);
}else {
var newary = Array.prototype.slice.call(arguments);
}
//数组从小到打排序
newary.sort(function (a,b) {
return a-b;
});
//删除数组开头的最小项
newary.shift();
//删除数组末尾最大项
newary.pop();
//求平均数,并返回结果
return (eval(newary.join('+'))/newary.length).toFixed(2)
}
var result1 = sum(156,423,90,5,24,66,450,25,4,86,76,64,5,88,63,33,42,34,46,19,48,35,70);
console.log(result1); // = >71.33
var arr = [1,2,3,4,5,6,7,8,9];
var result2 = sum(arr);
console.log(result2); // = >5.00
// = > 常规方法改进:2.0版
function sum(arg) {
console.log(arg instanceof Array);
if (!(arg instanceof Array)) {
console.log("如果不是数组,执行下面语句");
var newary = Array.prototype.sort.call(arguments, function (a,b) {return a - b;});
} else {
console.log("如果是数组,执行下面语句");
var newary = Array.prototype.sort.apply(arguments[0],function (a,b) { return a-b;});
}
//删除数组开头的最小项
Array.prototype.shift.call(newary);
//删除数组末尾最大项
Array.prototype.pop.call(newary);
//求平均数,并返回结果
return (eval([].join.call(newary,'+')) / newary.length).toFixed(2)
}
var result1 = sum(156, 423, 90, 5, 24, 66, 450, 25, 4, 86, 76, 64, 5, 88, 63, 33, 42, 34, 46, 19, 48, 35, 70);
console.log(result1); // => 71.33
var arr = [1,2,3,4,5,6,7,8,9];
var result2 = sum(arr);
console.log(result2); //=>5.00
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