在 jquery 选择器上调用函数
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calling function on jquery selector
提问by geoff swartz
Okay, normally I would consider myself an intermediate user of jquery, but this seems like a very noob issue that I'm not quite sure how to code.
好的，通常我会认为自己是 jquery 的中级用户，但这似乎是一个非常菜鸟的问题，我不太确定如何编码。
I have one div that I want to run a function against. The only way I'm aware of how to do this is something like...
我有一个 div，我想针对它运行一个函数。我知道如何做到这一点的唯一方法是......
$("#divname").each(function(){
dostuff();
});
This seems like a bit more work when I know there will only be one element. I tried this...
当我知道只有一个元素时，这似乎需要更多的工作。我试过这个...
$("#divname", function(){
console.log($(this));
});
... but it writes out the whole dom. I just want to run the function on this one element. How do I do that?
...但它写出了整个 dom。我只想在这个元素上运行该函数。我怎么做？
采纳答案by thecodeparadox
If you maintain that each element in HTML DOM has unique idthat means no two elements have same id, then $('#divname')always return a single element and $('#divname').each()will run one time. not more than one.
如果您认为 HTML DOM 中的每个元素都是唯一的id，这意味着没有两个元素具有相同的id，则$('#divname')始终返回单个元素并且$('#divname').each()将运行一次。不超过一个。
Now in your case you want something like
现在在你的情况下你想要类似的东西
dosomething( $('#divname') );
For example:
例如：
function doSomething( el ) {
el.append('<span>hello</span>');
}
doSomething( $('#divname') );
回答by Sampson
You should callthe function, passing your element in as its object:
您应该调用该函数，将您的元素作为其对象传入：
function doStuff() {
alert( $(this).html() );
}
doStuff.call( $("#foo")[0] );
Due to the way we built and call doStuff, we can still use it as a callback on .each:
由于我们构建和调用的方式doStuff，我们仍然可以使用它作为回调.each：
$(".bar").each( doStuff );
