我想做一个首屏和第二屏之间滚动鼠标滚轮就可以整平切换的效果,遇到了很多问题,后来在kk的帮助下,终于解决了这个问题,甚是欢喜,于是记录一下:
我最初的代码是这样的:
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<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" />
< style >
div {
width: 700px;
height: 1000px;
}
.red {
background-color: red;
}
.yellow {
background-color: yellow;
}
</ style >
</ head >
< body >
< div class = "red" > </ div >
< div class = "yellow" > </ div >
< div class = "red" > </ div >
< div class = "yellow" > </ div >
< div class = "red" > </ div >
</ body >
< script src = "../jQuery/jquery.min.js" ></ script >
< script src = "test.js" ></ script >
</ html >
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$(document).ready( function (){
var height = $(window).height(); //获取浏览器窗口当前可见区域的大小
//鼠标滚动之后整屏切换
var scrollFunc = function (e){
var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
e = e || window.event;
if ((e.wheelDelta<0|| e.detail>0) && scrollTop>=0 && scrollTop<height){ //不同浏览器向下滚动
$(document.body).animate({scrollTop:height}, "fast" );
$(document.documentElement).animate({scrollTop:height}, "fast" );
} else if ((e.wheelDelta>0 || e.detail<0) && scrollTop>=height && scrollTop<=height+20){ //不同浏览器向上滚动
$(document.body).animate({scrollTop:0}, "fast" );
$(document.documentElement).animate({scrollTop:0}, "fast" );
}
};
//注册事件
if (document.addEventListener){
document.addEventListener( 'DOMMouseScroll' ,scrollFunc, false );
}
window.onmousewheel = document.onmousewheel = scrollFunc; //IE、chrome、safira
});
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这样的代码我在IE和火狐下测试都是正常的,但是在谷歌下onmousewheel事件总是会触发多次,这是一个极其恼人的事情,为什么会多次触发呢?经过调试,我发现是我们每次滚动鼠标时都是很“凶残”的一下子滚动很大一个幅度,而不是一小格一小格的慢慢滚动,这就导致了滚动的时候会多次触发onmousewheel事件,调用scrollFunc函数,在函数内的animate函数没有执行完的时候还是不断的被调用,这样就会出现滚动多次滚动条滚不下来页滚不上去的情况。于是,我将上面的js代码改成了下面这样:
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$(document).ready( function (){
var height = $(window).height();
var scrollFunc = function (e){
document.onmousewheel = undefined;
var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
e = e || window.event;
if ((e.wheelDelta<0|| e.detail>0) && scrollTop>=0 && scrollTop<height){
$(document.body).animate({scrollTop:height}, "fast" , "linear" , function (){
document.onmousewheel = scrollFunc;
});
$(document.documentElement).animate({scrollTop:height}, "fast" , "linear" , function (){
document.onmousewheel = scrollFunc;
});
} else if ((e.wheelDelta>0 || e.detail<0) && scrollTop>=height && scrollTop<=height+20){
$(document.body).animate({scrollTop:0}, "fast" , "linear" , function (){
document.onmousewheel = scrollFunc;
});
$(document.documentElement).animate({scrollTop:0}, "fast" , "linear" , function (){
document.onmousewheel = scrollFunc;
});
}
};
if (document.addEventListener){
document.addEventListener( 'DOMMouseScroll' ,scrollFunc, false );
}
document.onmousewheel = scrollFunc;
});
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好了,现在的代码已经能够正常运行了,不过由于我是一只菜鸟,代码写的不够精致,又被kk说了,在他的提示下,我将冗余的代码又进行了一番修改:
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$(document).ready( function (){
var height = $(window).height();
var width = $(window).width();
var body;
if (navigator.userAgent.indexOf( "Firefox" )>0 || navigator.userAgent.indexOf( "MSIE" )>0){
body = document.documentElement;
} else {
body = document.body;
}
var isFinish = true ;
var scrollFunc = function (e){
if (isFinish){
var scrollTop = body.scrollTop;
e = e || window.event;
if ((e.wheelDelta<0|| e.detail>0) && scrollTop>=0 && scrollTop<height-20){
scroll(height);
} else if ((e.wheelDelta>0 || e.detail<0) && scrollTop>=height && scrollTop<=height+20){
scroll(0);
}
}
};
var scroll = function (height){
isFinish = false ;
$(body).animate({scrollTop:height}, "fast" , "linear" , function (){
isFinish = true ;
});
};
if (navigator.userAgent.indexOf( "Firefox" )>0){
if (document.addEventListener){
document.addEventListener( 'DOMMouseScroll' ,scrollFunc, false );
}
} else {
document.onmousewheel = scrollFunc;
}
});
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终于得到简介的代码了,不得不说,通过解决这个问题,还是学到很多的。以后要向着“write less, do more”的目标更加努力了!!!
如果有哪里写的不对的,欢迎各位大神们指教,我会虚心学习的。