使用 Javascript 将新列表元素添加到无序列表
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Adding new list elements to an unordered list with Javascript
提问by Rob
I am trying to add new elements to an unordered list with the following code:
我正在尝试使用以下代码将新元素添加到无序列表中：
The HTML:
HTML：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Javascript</title>
<link rel="stylesheet" href="jsPlay.css" type="text/css" />
<script src="jsPlay.js"></script>
</head>
<body>
<ul id="numberList"></ul>
</body>
</html>
The Javascript:
Javascript：
window.onload = function()
{
//alert("Window is loaded");
var numberList = document.getElementById("numberList");
//for every number between 100 and 200
for(var i = 0; i > 100 && i < 200; i++)
{
if ( i % 17 == 0 && i % 2 == 0) //if number evenly divisible by 17 and 2
{
//create new li element
var newNumberListItem = document.createElement("li");
//create new text node
var numberListValue = document.createTextNode(i);
//add text node to li element
newNumberListItem.appendChild(numberListValue);
//add new list element built in previous steps to unordered list
//called numberList
numberList.appendChild(newNumberListItem);
}
}
}
When I run this in my browser, I just get nothing but white-space. I check in FireBug (on Firefox 15.0.1) to see if there are any errors, but there is nothing noticeable. I think I am not binding something together properly - it seems like such a basic problem but I can't seem to fgure out why the elements aren't being added to the unordered list.
当我在浏览器中运行它时，我只得到空白。我检查了 FireBug（在 Firefox 15.0.1 上）以查看是否有任何错误，但没有什么值得注意的。我想我没有正确地将某些东西绑定在一起 - 这似乎是一个基本问题，但我似乎无法弄清楚为什么元素没有被添加到无序列表中。
I'm sure the commenting in the Javascript code is sufficient, but feel free to ask me questions if it isn't.
我确信 Javascript 代码中的注释足够了，但如果不是，请随时问我问题。
Many thanks for the help :).
非常感谢您的帮助 ：）。
回答by grc
Your for loopimmediately fails because iis not greater than 100. If you try something like this it should work:
你的for 循环立即失败，因为i它不大于 100。如果你尝试这样的事情，它应该可以工作：
for (var i = 100; i < 200; i++)
Example: http://jsfiddle.net/grc4/gc4X5/1/
