我有这个代码:
$("#open").click(function()
{
var pos = $(window).scrollTop();
/* the next lines of code affects the value
* of 'pos'.
*/
});
$("#close").click(function()
{
var pos = /* what i want here is the $(window).scrollTop();
before the #open event handler changes it's value. */
//another code of mine.
});
有人能帮我吗?提前谢谢。
这很简单,使变量全局
var pos; //global variable
$("#open").click(function()
{
pos = $(window).scrollTop();
/* the next lines of code affects the value
* of 'pos'.
*/
});
$("#close").click(function()
{
// use pos here accordingly
//another code of mine.
});
您可以在调用任何函数之前存储原始window
DOM内容:
var pos;
$("#open").click(function(){
pos = $(window).scrollTop();
});
$("#close").click(function(){
$(window).height(pos);
});
文档
- http://api.jquery.com/scrollTop/
- http://api.jquery.com/height/
You could just organize a little your code and do this:
function MyApp(){
var self = this;
this.pos = "";
this.temp = $(window).scrollTop(); //store initial value
this.wire = function(){
$("#open").click(self.open);
$("#close").click(self.close);
}
this.open = function(){
self.pos = $(window).scrollTop();
/* the next lines of code affects the value
* of 'pos'.
*/
}
this.close = function(){
self.pos = /* what i want here is the $(window).scrollTop(); before
* the #open event handler changes it's value.
*/
//another code of mine.
var original = self.temp; //here get the initial stored value
}
}
示例:
<script type="text/javascript">
$(function() {
var app = new MyApp();
app.wire(); //wire handlers
});
</script>
我会使用一个匿名函数的本地变量:
(function() {
var context = {};
$('#open').click(function() {
context.pos = $(window).scrollTop();
});
$('#close').click(function() {
// Do something with context.pos
});
})();
您的代码和解释并没有明确说明这一点,但以上内容保留了代码中的一个假设:除非单击了打开,否则无法单击关闭;除非单击了关闭,否则无法再次单击打开。但这实际上取决于你的代码——如果这个假设不成立,我会采取不同的方法(如果这个假设不是真的,点击此处关闭可能会得到一个未定义的)。
更安全的方式。
$("#open").click(function() {
$("#close").attr("data-pop", $(window).scrollTop());
});
$("#close").click(function() {
var pos = $(this).attr("data-pop");
});