我需要随机化 5-n 里项目的列表,并为特定位置的 1-5 项目设置,例如,我有
- 一个
- b
- c
- d
- e
- f
我想随机化最后 4 个并放在 li[0] 字母 D 和 li[2] 字母 F 上 结果:
- d
- f
- c
- b
- 一个
- e
这是我的代码。我哪里错了?谢谢!
var ul = document.querySelector('ul');
for (var i = ul.children.length; i >= 0; i--) {
if(ul.children.innerHTML == "XXX") {
ul.appendChild(ul.children[0]);
}
if(ul.children.innerHTML == "XXXX") {
ul.appendChild(ul.children[1]);
}
if(ul.children.innerText == "XX") {
ul.appendChild(ul.children[2]);
} else {
ul.appendChild(ul.children[generateRandom(i) | 0]);
}
}
function generateRandom(i) {
var num = Math.random() * i | 0;
return (num === 0 || num === 1 || num === 2) ? generateRandom(i) : num;
}
最佳答案
var $test = $('#test');
var $li = $test.children();
while ($li.length > 0) {
//pick a random li from the variable
var $next = $li.eq( Math.floor( Math.random() * 10 * $li.length ) % $li.length );
//move it to the end of ul
$test.append($next);
//remove the li from our variable so it won't be found again
$li = $li.not($next);
}
//move the f to the top, so when we move the d to the top it will be second
$test.prepend($test.children().filter(function(){ return this.innerHTML === 'f'; }));
//move the d to the top
$test.prepend($test.children().filter(function(){ return this.innerHTML === 'd'; }));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="test">
<li>a</li>
<li>b</li>
<li>c</li>
<li>d</li>
<li>e</li>
<li>f</li>
<li>g</li>
<li>h</li>
<li>i</li>
<li>j</li>
<li>k</li>
</ul>
关于javascript - 随机化 li 项并卡住多个,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47232470/