jQuery 获取属性
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jQuery getAttribute
提问by theHack
i have an "uid" attribute and it's value on my "body" tag...
我有一个“uid”属性，它在我的“body”标签上的值...
$(document).ready(regFunct());
function regFunct(){
alert($("body").attr("uid"));
}
but it says "undefined". something wrong?
但它说“未定义”。有事吗？
回答by TheVillageIdiot
try:
尝试：
$(document).ready(function(){
regFunct();
});
function regFunct(){
alert($("body").attr("uid"));
}
回答by jAndy
You are putting the return-value from regFunctinto the .ready()handler method. That is, undefinedbecause your function does not return anything.
您正在将返回值regFunct放入.ready()处理程序方法中。也就是说，undefined因为您的函数不返回任何内容。
You need to pass in the function reference, by omitting the parenthesis:
您需要通过省略括号来传递函数引用：
$(document).ready(regFunct);
回答by Baptiste Pernet
Hi adding custom attribute is a bad behavior. have a look at http://www.w3schools.com/tags/tag_body.aspyou will no uid attribute.
嗨，添加自定义属性是一种不好的行为。看看http://www.w3schools.com/tags/tag_body.asp你不会有 uid 属性。
If you want to store you own data. use $.data(see documentation in jQuery site)
如果你想存储你自己的数据。使用$.data（请参阅jQuery 站点中的文档）
// save the value
$('body').data('uid', mycustomvalue);
// retrieve the value
$('body').data('uid');
If the data come from the server, you can still do
如果数据来自服务器，你仍然可以做
<script type="text/javascript">
$(function() {
$('body').data('uid', '<?php echo $_GET[uid] ?>');
});
</script>
回答by Harish
$(document).ready(regFunct);
set to rel tag and check!
设置为 rel 标签并检查！
function regFunct(){
alert($("body").attr("rel"));
}
回答by raRaRa
UPDATE: It seems to be undefined in Internet Explorer since uid is not a known attribute. The fix would be to use the jQuery.data()to insert data to an element.
更新：它在 Internet Explorer 中似乎未定义，因为 uid 不是已知属性。解决方法是使用jQuery.data()将数据插入元素。
$(document).ready(regFunct());
function regFunct(){
$('body').data('uid', 1337);
alert($('body').data('uid'));
}
But you would have to assign the uid yourself. For example you could do it via <script>on the page.
但是您必须自己分配 uid。例如，您可以通过<script>在页面上进行操作。
<script type="text/javascript">
$(document).ready(setData());
function setData(){
$('body').data('uid', 1337);
}
</script>
More on jQuery.data() on http://api.jquery.com/jQuery.data/
有关 jQuery.data() 的更多信息，请访问http://api.jquery.com/jQuery.data/
Working example: http://jsfiddle.net/6Bwtt/1/
工作示例：http: //jsfiddle.net/6Bwtt/1/
BUT if you are trying to save data on the page from the server-side, you could just have some invisible element after the body, for example <div id="uid" style="display:none;">Your ID here</div>then fetch it using $("#uid").html();Voila! :)
但是，如果您尝试从服务器端保存页面上的数据，则您可以在正文之后添加一些不可见的元素，例如，<div id="uid" style="display:none;">Your ID here</div>然后使用$("#uid").html();Voila获取它！:)
