来自数组的值，JavaScript

Question

提示用户进行许多输入，将其存储在一个数组中，然后打印求和，平均值，最大数，最小数和大于平均值的数。 我定义了一个名为magicnumber的JavaScript变量，它是一个新的Array，并输出array的值，如下所示：

 var magicnumber = []; mymagicNumber(); function mymagicNumber() { //Specify the size of array var size = parseInt(prompt("How many data values do you need have?")); for (var i = 1; i <= size; i++) { //sorted in array var num = parseInt(magicnumber.push(prompt("Enter data value number " + i))); var s = magicnumber.join(', '); } //Display array element document.getElementById("demo1").innerHTML = "Your data : " + s + "<br>"; } 

 <div id="demo1"></div> 

我该如何总结呢？

Answer 1

这是2种无需使用for循环即可找到总和的方法。

 var magicnumber = []; function mymagicNumber() { //Specify the size of array var size = parseInt(prompt("How many data values do you need have?")); for (var i = 1; i <= size; i++) { //sorted in array var num = magicnumber.push(parseInt(prompt("Enter data value number " + i))); } var data = magicnumber.join(', '); var s1 = magicnumber.reduce(function(acc, val) { return acc + val; }); var s2 = eval(magicnumber.join("+")); //Display array element document.getElementById("demo1").innerHTML = "Your data : " + data + "<br>"; document.getElementById("demo2").innerHTML = "Sum is: " + s1 + "<br>"; document.getElementById("demo3").innerHTML = "Sum is: " + eval(s2) + "<br>"; } mymagicNumber(); 

 <div id="demo1"></div> <div id="demo2"></div> <div id="demo3"></div> 

Answer 2

您可以使用Array#reduce()获得总和

 var magicnumber = []; mymagicNumber(); function mymagicNumber() { //Specify the size of array var size = parseInt(prompt("How many data values do you need have?")); for (var i = 1; i <= size; i++) { var promptValue = prompt("Enter data value number " + i); magicnumber.push(+promptValue); } var sum = magicnumber.reduce((a,b)=>{return a+b},0); //Display array element document.getElementById("demo1").innerHTML = "Your data : " + magicnumber.join(', '); document.getElementById("sum").innerHTML = "The sum : " + sum; } 

 <div id="demo1"></div> <div id="sum"></div>