只是想知道为什么我的代码不起作用。我这样做完全错了吗？
window.onload = function random() {
var links = document.getElementsByTagName('a');
var colours = new Array("green","red","blue");
var randomColour = colours[Math.floor(colours.length * Math.random())];
for (a = 0; a < links.length; a++) {
links[a].style.color = 'randomColour';
}
}
'randomColor'-> randomColor。
使用变量而不是带引号的字符串。此外，为确保每个链接获得随机颜色，请在循环中生成颜色：
for (var a = 0; a < links.length; a++) {
var randomColour = colours[Math.floor(colours.length * Math.random())];
links[a].style.color = randomColour;
}
为了最大限度地减少设置颜色和解析链接之间的延迟，绑定一个DOMContentLoaded事件，或者简单地将代码粘贴到<body>：
<a>Test</a>
...
<a>Test</a>
<script>
(function() { // <-- Anonymous function to not leak variables to the global scope
var links = document.getElementsByTagName('a');
var colours = ["green", "red", "blue"];
for (var a = 0; a < links.length; a++) {
var randomColour = colours[Math.floor(colours.length * Math.random())];
links[a].style.color = randomColour;
}
})();