jquery 實作返回頂部功能_jquery

今天搞了一個回到頂部的JS JQ功能，廢話不多說，有圖有真相！

複製程式碼 程式碼如下:

(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=$('

'); 
    feedHtml.html('u8fd4u56deu9876u90e8 u610fu89c1u53cdu9988'); 
    $("body").append(feedHtml); 
    __ie6Fixed()
    }; 
//綁定事件
var __initEvent=function(){ 
    $(視窗).resize(function(){ 
    var winW=$(this).width(); 
    if(winW     else{$("#pubFeedBack").show()} 
    }); 
    $(window).bind("滾動",function(){ 
    if($(this).scrollTop()>50){ 
    $("#backTop").fadeIn().css({"display":"block"}) 
    } 
    else{$("#backTop").fadeOut().css({"display":""})} 
    }); 
    $("#backTop").bind("click",function(e){ 
    e.preventDefault();                              
    $("html,body").scrollTop(0)}); 
}; 
// 回頂端
var __tip=函數（型，tipText）{ 
var SurveyTip=$("#D_SurveyTip"),surveyMask=$("#D_SurveyMask"); 
if(!surveyTip||!surveyMask){return} 
SurveyTip.removeClass("警告成功").addClass(type).html(tipText); 
SurveyMask.css("顯示","阻止"); 
SurveyTip.css("顯示","阻止"); 
setTimeout(函數(){ 
SurveyMask.css("顯示","無");                                                                                                                                                                                                                                                                                       SurveyTip.css("顯示","無")},1000) 
}; 
//ie6 相容
var __ie6Fixed=function(){   
    if(ieVersion!==6){return} 
    var SurveyBox=$("#D_SurveyBox"); 
    var pubFeedBack=$("#pubFeedBack"); 
    if(!surveyBox||!pubFeedBack)
    { 
        返回
    } 
    $(window).bind("滾動",function(){ 
    var h=$(window).height(),st=$(window).scrollTop(),_top=h st-options.height;                                                                                                                                                         var _top1=h st-pubFeedBack.height()-15;surveyBox.css("top",_top "px"); 
    pubFeedBack.css("top",_top1 "px") 
    }) 
}; 
//開始執行
if(screen.width>=1280) 
{ 
    （函數（）{ 
    __feedCreat();                                                                                                                                          __initEvent()                                                                                                                                                                              })() 
} 
} 
})(jQuery); 
window.onerror=function(){返回 false}; 
if($.isFunction($(document).survey)){$(document).survey()} 

複製程式碼程式碼如下：

#backTop i,#callSurvey i{background:url(survey.png) no-repeat;} 
#pubFeedBack{position:fixed;_position:absolute;right:15px;bottom:15px;width:54px;font-size:12px;} 
#backTop,#callSurvey{display:block;width:52px;padding:1px;height:56px;line-height:22px;text-align:center;color:#fff;text-decoration:none;} 
#backTop{顯示：無;背景：#999;} 
#backTop:懸停{背景:#ccc;縮放:1;文字裝飾:無;顏色:#fff;} 
#backTop i{display:block;width:25px;height:13px;margin:14px auto 8px;background-position:-63px 0;} 
#callSurvey{margin-top:1px;background:#3687d9;} 
#callSurvey:hover{背景:#66a4e3;zoom:1;text-decoration:none;color:#fff;} 
#callSurvey i{display:block;width:26px;height:25px;margin:9px auto 0;background-position:0 0;} 
#callSurvey：停留在{背景位置：-30px 0;} 

程式碼很簡單，各位直接拿去，放在自己專案中即可，如有bug請給我留言，共同完善

方法二：

主要參數：
scrollName: 'scrollUp', // Element ID
topDistance: '300', // Distance from top before showing element (px)
topSpeed: 300, // Speed back to top (ms)
animation: 'fade', // Fade, slide, none
animationInSpeed: 200, // Animation in speed (ms)
animationOutSpeed: 200, // Animation out speed (ms)
scrollText: 'Scroll to top', // Text for element
activeOverlay: false,
// 幫助定位「回到頂端」按鈕出現時捲動到的頁面位置。

jquery程式碼（ScrollUp.js）：

$(function () {
$.scrollUp({
scrollName: 'scrollUp', 
// Element ID
topDistance: '300', 
// Distance from top before showing element (px)
topSpeed: 300, 
// Speed back to top (ms)
animation: 'fade', 
// Fade, slide, none
animationInSpeed: 200, 
// Animation in speed (ms)
animationOutSpeed: 200, 
// Animation out speed (ms)
scrollText: 'Scroll to top', 
// Text for element
activeOverlay: false, 
// set css color to display scrollup active point, e.g '#00ffff'
});
});