如何在jquery中运行一个函数 [英] How to run a function in jquery
问题描述
我是一名编程新手,我无法弄清楚如何在JQuery中存储函数并在多个位置运行。
我有:
$(function(){
$(div.class)。click(function(){
// Doo something
});
$(div.secondclass ).click(function(){
// Doo something
});
});
现在2// Doo somethings是一样的,我不想写
如果我放:
$(函数(){
函数doosomething()
{
// Doo something
}
$(div.class) .click(dobodything);
$(div.secondclass)。click(dobodything);
});
这会在页面加载时运行该功能,而不是仅在点击时运行。
我如何正确地做到这一点?
谢谢!
以下应该很好。
$(function(){
//方式1
函数doosomething()
{
// Doo something
}
//方式2,等同于方式1
var dobodything = function(){
// Doo something
}
$(div.class)。click(dobodything);
$(div.secondclass)。click(dobodything);
});
基本上,你正在声明你的函数和你正在使用它的范围相同(JavaScript使用闭包来确定范围)。
现在,由于JavaScript中的函数与任何其他对象的行为类似,因此您可以简单地使用 .click(dobodything)将
doosomething
作为函数调用, ;
使用 doosomething()
( dobodything
没有()
引用函数但不调用它)或调用另一个函数情况下,点击
处理程序)。
I'm a programming newbie, and I can't figure out how to store a function in JQuery and run in it multiple places.
I have:
$(function () {
$("div.class").click(function(){
//Doo something
});
$("div.secondclass").click(function(){
//Doo something
});
});
Now the 2 "//Doo somethings" are the same, and I don't want to write the same code again.
If I put:
$(function () {
function doosomething ()
{
//Doo something
}
$("div.class").click(doosomething);
$("div.secondclass").click(doosomething);
});
That would run the function on page load, rather than only when it clicks.
How do I do this correctly?
Thanks!
The following should work nicely.
$(function() {
// Way 1
function doosomething()
{
//Doo something
}
// Way 2, equivalent to Way 1
var doosomething = function() {
// Doo something
}
$("div.class").click(doosomething);
$("div.secondclass").click(doosomething);
});
Basically, you are declaring your function in the same scope as your are using it (JavaScript uses Closures to determine scope).
Now, since functions in JavaScript behave like any other object, you can simply assign doosomething
as the function to call on click by using .click(doosomething);
Your function will not execute until you call it using doosomething()
(doosomething
without the ()
refers to the function but doesn't call it) or another function calls in (in this case, the click
handler).
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