我正在为学校项目工作,我正在尝试从名单列表中生成随机的名字组。组的大小和组的数量将基于用户输入。我有代码从数组中随机生成一个元素,但我需要一些帮助分组。 这是我的代码到目前为止。它不起作用 请帮助谢谢
function yeah()
{
var arr = prompt("Enter your names").split(",")
console.log(arr);
var random = arr[Math.floor(Math.random() * arr.length)];
document.getElementById("h2").innerHTML = random;
}
function groups()
{
var arr = prompt("Enter your names").split(",");
var random = arr[Math.floor(Math.random() * arr.length)];
var numElem = document.getElementById("input2").value;
for (i=0;i <= arr.length; i++)
{
var newArr = [random];
console.log(newArr);
//print name to a new list
//remove name from old list
/* var arr = prompt("Enter your names").split(",")
var groupNum = document.getElementById("input1").value;
var newArrays = arr.length / groupNum; */
}
}
/* Reset */
* {
margin: 0;
padding: 0;
}
html,body {
height:100%;
margin:0;
font-family: 'Montserrat', 'sans-serif';
color:#424242;
overflow: hidden;
}
.display {
text-align: center;
display: table;
height:100%;
margin:0 auto;
}
.wrap {
display: table-cell;
vertical-align: middle;
}
p {
font-size: 50px; /* For lamers who don't support viewport sizing */
font-size:20vmin;
text-align: center;
margin: 0;
}
#h2 {
float: center;
font-size: 30vmin;
background-size: contain;
}
input.text-display {
display: inline-block;
color: #5E5E5E;
font: bold 20px arial;
text-decoration: none;
text-align: center;
margin: 20px auto;
padding: 15px 20px;
background: #EFF0F2;
border-radius: 4px;
border-top: 1px solid #F5F5F5;
box-shadow: inset 0 0 25px #E8E8E8, 0 1px 0 #C3C3C3, 0 2px 0 #C9C9C9, 0 2px 3px #333;
text-shadow: 0px 1px 0px #F5F5F5;
}
span.love {
display: block;
position: absolute;
bottom:10px;
width: 100%;
text-align: center;
}
span.love a {
text-decoration: none;
color:#D12026;
}
.twitter-follow-button {
vertical-align: text-bottom;
}
.twitter-share-button {
vertical-align: text-bottom;
}
<div class="display">
<div class="wrap">
<p>Your random value is:</p>
<div id="h2">Null</div>
<input class="text-display" type="button" onclick="yeah()" height="50px" width="50px" value="click to input data">
<!-- <input type="button" onclick="display()" value="display random"> -->
<br>
<input id="input1" value="Enter number of Groups">
<input id="input2" value="Enter number of elements per Group">
<input type="button" onclick="groups()">
</div>
</div>
答案 0 :(得分:1)
这是第一个修复:向数组中添加一个新元素(就像你在for循环中看到的那样),你应该使用arr.push()方法。您还希望在此之前将newArr声明为空数组。
但是,我并不完全确定您在群组功能中执行的操作是什么。现在,您似乎从列表中选择了一个随机名称,然后,与列表中的名称一样多次,将一个随机名称分配给新阵列。可能对您有帮助的是只写出您要采取的步骤列表(我们称之为伪代码),然后将该列表转换为javascript代码。找到该列表中的不一致性要比筛选有时令人困惑的代码要容易得多。
希望这有帮助,如果您有任何其他问题,请与我联系!
答案 1 :(得分:0)
不确定您的功能组正在做什么。正如我所看到的,它将arr中的所有数据放入并随机序列放入newarr中。您应该检查.push()方法以创建新数组。它应该使你的代码工作。
示例代码:
var newarr = ["David", "Mic"];
newarr.push("Adeline");
结果:您的newarr将包含所有3个名字。
答案 2 :(得分:0)
这是我对你的问题的解释。希望它有所帮助..
<script>
var arr = new Array();
function yeah()
{
arr = prompt("Enter your names").split(",")
console.log(arr);
//var random = arr[Math.floor(Math.random() * arr.length)];
var allStudents ="";
for(var i=0; i<arr.length; i++) {
allStudents += arr[i] + "<br/>\n";
}
document.getElementById("h2").innerHTML = allStudents;
}
function groups()
{
var arr = prompt("Enter your names").split(",");
var groups = document.getElementById("groups").value;
var perGrp = document.getElementById("per_grp").value;
var innerText = "<h4>All</h4> ";
for(var i=0; i<arr.length; i++) {
innerText += arr[i] + ",";
}
innerText += "<br/>\n";
arr = shuffleArray(arr);
var finalGroups = new Array();
for(var i=0; i<groups; i++) {
// assign shuffled elements
var grpArr = "";
for(j=0; j<perGrp; j++) {
grpArr += arr[0] + ",";
arr.shift(); // removes first element from array
}
grpArr = grpArr.substring(0,grpArr.length - 1);
finalGroups[i] = grpArr;
}
innerText += "<h4>Groups</h4><br/>\n";
innerText += "<table width='100%' border='1'><tr>\n";
for(var i=0; i<groups; i++) {
// print groups
var j=i+1;
var grpArr = finalGroups[i].split(",");
innerText += "<td>Group " +j+"<br>";
for(var k=0; k < grpArr.length; k++){
innerText += grpArr[k] + "<br>";
}
innerText += "</td>\n";
}
innerText += "</tr></table>\n";
document.getElementById("FinalGroups").innerHTML = innerText;
}
/**
* Randomize array element order in-place.
* Using Durstenfeld shuffle algorithm.
*/
function shuffleArray(array) {
for (var i = array.length - 1; i > 0; i--) {
var j = Math.floor(Math.random() * (i + 1));
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
return array;
}
</script>
<style>
/* Reset */
* {
margin: 0;
padding: 0;
}
html,body {
height:100%;
margin:0;
font-family: 'Montserrat', 'sans-serif';
color:#424242;
overflow: hidden;
}
.display {
text-align: center;
display: table;
height:100%;
margin:0 auto;
}
.wrap {
display: table-cell;
vertical-align: middle;
}
p {
font-size: 30px; /* For lamers who don't support viewport sizing */
font-size:10vmin;
text-align: center;
margin: 0;
}
#h2 {
float: center;
font-size: 10vmin;
background-size: contain;
}
input.text-display {
display: inline-block;
color: #5E5E5E;
font: bold 20px arial;
text-decoration: none;
text-align: center;
margin: 20px auto;
padding: 15px 20px;
background: #EFF0F2;
border-radius: 4px;
border-top: 1px solid #F5F5F5;
box-shadow: inset 0 0 25px #E8E8E8, 0 1px 0 #C3C3C3, 0 2px 0 #C9C9C9, 0 2px 3px #333;
text-shadow: 0px 1px 0px #F5F5F5;
}
span.love {
display: block;
position: absolute;
bottom:10px;
width: 100%;
text-align: center;
}
span.love a {
text-decoration: none;
color:#D12026;
}
.twitter-follow-button {
vertical-align: text-bottom;
}
.twitter-share-button {
vertical-align: text-bottom;
}
</style>
<div class="display">
<div class="wrap">
<p>Create Random Groups</p>
<!--<div id="h2"> </div>
<input class="text-display" type="button" onclick="yeah()" value="click to input data"> -->
<!-- <input type="button" onclick="display()" value="display random"> -->
<br>
<input id="groups" placeholder="Enter number of Groups" >
<input id="per_grp" placeholder="Enter number of elements per Group">
<br/>
<input type="button" value="Create Groups" onclick="groups()">
<div id="FinalGroups"></div>
</div>
</div>