我有以下 JavaScript 代码:
function createNotification(title, body, canDismiss, callback)
{
//create the container
var nContainer = document.createElement("div");
nContainer.setAttribute("id", "note"+title);
nContainer.setAttribute("class","nContainer");
nContainer.className = "nContainer";
//create the title
var nTitle = document.createElement("div");
nTitle.setAttribute("class", "nTitle");
nTitle.className = "nTitle";
nTitle.innerHTML = title;
//if canDismiss is true then add controls
if (canDismiss)
{
var nDismiss = document.createElement("div");
nDismiss.setAttribute("class", "nDismiss");
nDismiss.className = "nDismiss";
nDismiss.innerHTML = "[close]";
nDismiss.onclick = function(){destroyNotification(title);callback();};
nTitle.appendChild(nDismiss);
}
//append the title to the container
nContainer.appendChild(nTitle);
//create the body and append to container
var nBody = document.createElement("div");
nBody.setAttribute("class", "nBody");
nBody.className = "nBody";
nBody.innerHTML = body;
nContainer.appendChild(nBody);
document.body.appendChild(nContainer);
//fade background
fadeIt(title);
}
function destroyNotification(title)
{
//get the specified notification
var note = document.getElementById("note"+title);
//remove the notification
document.body.removeChild(note);
//unfade the background
unfadeIt(title)
}
function fadeIt(title)
{
//create a partially opaque div and append it to the document
var Fade = document.createElement("div");
Fade.setAttribute("id", "fade"+title);
Fade.setAttribute("class","fade");
Fade.className = "fade";
document.body.appendChild(Fade);
}
function unfadeIt(title)
{
//get the specified fade element
var Fade = document.getElementById("fade"+title);
//remove the specified fade element
document.body.removeChild(Fade);
}
我收到 document.body 错误。有人可以帮忙吗？
这是 html:
<html>
<head>
<title></title>
<script langauge="javascript" type="text/javascript" src="notification.js"> </script>
<link rel="stylesheet" type="text/css" href="notification.css" />
<script language="javascript" type="text/javascript">
createNotification("The Title", "Some sort of message for our body", true, function(){alert("A Callback");});
</script>
</head>
<body>
</body>
</html>
我从 firebug 得到的错误是:
document.body is null
[Break on this error] document.body.appendChild(nContainer);
最佳答案
您甚至在页面加载之前就执行了函数createNotification。当您调用 body 元素时，它甚至不存在。
调用页面底部的函数或者添加load事件[link] .
关于javascript - 收到 document.body 错误。帮助!，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3642387/