jquery 实现返回顶部功能

今天搞了一个回到顶部的JS JQ功能,废话不多说,有图有真相!

jquery 实现返回顶部功能

jquery 实现返回顶部功能

复制代码 代码如下:


(function($){      
$.fn.survey=function(options){ 
var defaults={width:"298",height:"207"}; 
var options=$.extend(defaults,options); 
    if($.browser.msie){ 
    var ieVersion=parseInt($.browser.version)} 
//建立HTML 
var __feedCreat=function(){ 
    var feedHtml=$('<div></div>'); 
    feedHtml.html('<a href="#top"><i></i>\u8fd4\u56de\u9876\u90e8</a><a href="#"><i></i>\u610f\u89c1\u53cd\u9988</a>'); 
    $("body").append(feedHtml); 
    __ie6Fixed() 
    }; 
//绑定事件 
var __initEvent=function(){ 
    $(window).resize(function(){ 
    var winW=$(this).width(); 
    if(winW<=1124){$("#pubFeedBack").hide()} 
    else{$("#pubFeedBack").show()} 
    }); 
    $(window).bind("scroll",function(){ 
    if($(this).scrollTop()>50){ 
    $("#backTop").fadeIn().css({"display":"block"}) 
    } 
    else{$("#backTop").fadeOut().css({"display":""})} 
    }); 
    $("#backTop").bind("click",function(e){ 
    e.preventDefault();                              
    $("html,body").scrollTop(0)}); 
}; 
//回到顶部 
var __tip=function(type,tipText){ 
var surveyTip=$("#D_SurveyTip"),surveyMask=$("#D_SurveyMask"); 
if(!surveyTip||!surveyMask){return} 
surveyTip.removeClass("warning success").addClass(type).html(tipText); 
surveyMask.css("display","block"); 
surveyTip.css("display","block"); 
setTimeout(function(){ 
surveyMask.css("display","none");                                                                                                                                                                                                                                                                                       surveyTip.css("display","none")},1000) 
}; 
//ie6兼容 
var __ie6Fixed=function(){   
    if(ieVersion!==6){return} 
    var surveyBox=$("#D_SurveyBox"); 
    var pubFeedBack=$("#pubFeedBack"); 
    if(!surveyBox||!pubFeedBack) 
    { 
        return 
    } 
    $(window).bind("scroll",function(){ 
    var h=$(window).height(),st=$(window).scrollTop(),_top=h+st-options.height;                                                                                                                                                         var _top1=h+st-pubFeedBack.height()-15;surveyBox.css("top",_top+"px"); 
    pubFeedBack.css("top",_top1+"px") 
    }) 
}; 
//开始执行 
if(screen.width>=1280) 

    (function(){ 
    __feedCreat();                                                                                                                                          __initEvent()                                                                                                                                                       })() 


})(jQuery); 
window.onerror=function(){return false}; 
if($.isFunction($(document).survey)){$(document).survey()} 

复制代码 代码如下:

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