同时循环。无法对while语句进行硬编码
同时循环。无法对while语句进行硬编码
提问于 2017-05-08 10:42:39
function start() {
var output = "";
var index = 0;
var total = 0;
var average = 0;
var arr = []
while(arr.length < 12){
var randomnumber = Math.ceil(Math.random()*20)
if(arr.indexOf(randomnumber) > -1) continue;
arr[arr.length] = randomnumber;
}
output = output + "List of all values in the array: " + arr;
output = output + "<br/>" + "Total number of values in the array: " + arr.length + "<br/>";
while(index < arr.length) {
total = total + arr[index];
index++;
}
average = total / index;
output = output + "Total of all values: " + total + "<br/>";
output = output + "Average of all values: " + average;
document.getElementById("msg").innerHTML = output;
}我被告知我不被允许硬编码的陈述，我如何去改变'while‘语句，所以我没有硬编码？
回答 2
Stack Overflow用户
回答已采纳
发布于 2017-05-08 10:47:05
可能他们是说
var arr = new Array(12);
var randIndex=0;
while(randIndex < arr.length){
var randomnumber = Math.ceil(Math.random()*20)
if(arr.indexOf(randomnumber) > -1) continue;
arr[randIndex] = randomnumber;
randIndex++;
}Stack Overflow用户
发布于 2017-05-09 06:55:14
看上去像是学校作业。如果不应该硬编码数组中的元素数(当前为12)，则需要从用户那里以某种方式获得该编号。或者使用随机数，如下所示。
注意:如果让用户指定元素的数量，就会有一个陷阱。我会留着它让你去探索和修复。
function start(len) {
var output = "";
var index = 0;
var total = 0;
var average = 0;
var arr = []
while(arr.length < len){
var randomnumber = Math.ceil(Math.random()*20)
if(arr.indexOf(randomnumber) > -1) continue;
arr[arr.length] = randomnumber;
}
output = output + "List of all values in the array: " + arr;
output = output + "<br/>" + "Total number of values in the array: " + arr.length + "<br/>";
while(index < arr.length) {
total = total + arr[index];
index++;
}
average = total / index;
output = output + "Total of all values: " + total + "<br/>";
output = output + "Average of all values: " + average;
document.getElementById("msg").innerHTML = output;
}
// start(10); // you can get the number of elements in array from user and pass it here. I'm passing hardcoded 10 for now.
start(Math.ceil(Math.random()*20)); // alternatively passing a random number <div id='msg'>
</div>
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原文链接：
https://stackoverflow.com/questions/43845596
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