这次给大家带来用requireJS添加返回顶部功能，用requireJS添加返回顶部功能的注意事项有哪些，下面就是实战案例，一起来看一下。
本文实例讲述了requireJS模块化实现返回顶部功能的方法。分享给大家供大家参考，具体如下：
引用requireJs
<script src="require.js" data-main="main"></script>
html部分
<script src="require.js" data-main="main"></script>
新建main.js
require.config({
paths:{
jquery:'jquery'
}
});
requirejs(['jquery','backtop'],function($,backtop){
$('#top').backtop({
mode:"move",
pos:100,
dest:500,
speed:20000
})
});创建backtop模块 backtop.js
/**
* Created by Administrator on 2016/3/24.
*/
define(["jquery","scrollTo"],function($, scroll){
function backtop(el,opts){
this.opts = $.extend({},backtop.default,opts);
this.$el = $(el);
this.scroll = new scroll.scrollTo({
dest:this.opts.dest,
speed:this.opts.speed
});
this._checkPostion();
if(this.opts.mode == "move"){
this.$el.on("click", $.proxy(this._move,this))
}else{
this.$el.on("click", $.proxy(this._go,this))
}
$(window).on("scroll", $.proxy(this._checkPostion,this))
};
backtop.prototype._move = function(){
this.scroll.move()
};
backtop.prototype._go = function(){
this.scroll.go()
};
backtop.prototype._checkPostion = function(){
if($(window).scrollTop() > this.opts.pos){
this.$el.fadeIn();
}else{
this.$el.fadeOut();
}
}
$.fn.extend({
backtop:function(opts){
return this.each(function(){
new backtop(this,opts);
})
}
});
backtop.default = {
mode:"move",
pos:100,
dest:0,
speed:800
}
return{
backtop:backtop
}
})backtop 依赖 scrollTo模块
创建scrollTo.js
define(['jquery'],function($){
function scrollTo(opts){
this.opts = $.extend({},scrollTo.DEFAULTS,opts);
this.$el = $("html,body");
}
scrollTo.prototype.move = function(){
if($(window).scrollTop() != this.opts.dest){
//if(!this.$el.is(":animated")){
this.$el.animate({scrollTop:this.opts.dest},this.opts.speed);
//}
}
};
scrollTo.prototype.go = function(){
this.$el.scrollTop(this.opts.dest)
};
scrollTo.DEFAULTS = {
dest:0,
speed:800
};
return {
scrollTo:scrollTo
}
});相信看了本文案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！
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