jquery javascript 回到顶部功能

今天搞了一个回到顶部的JS JQ功能

1. (function($){
2. $.fn.survey=function(options){
3. var defaults={width:"298",height:"207"};
4. var options=$.extend(defaults,options);
5. if($.browser.msie){
6. var ieVersion=parseInt($.browser.version)}
7. //建立HTML
8. var __feedCreat=function(){
9. var feedHtml=$('<div id="pubFeedBack"></div>');
10. feedHtml.html('<a href="#top" id="backTop"><i></i>\u8fd4\u56de\u9876\u90e8</a><a href="#" id="callSurvey"><i></i>\u610f\u89c1\u53cd\u9988</a>');
11. $("body").append(feedHtml);
12. __ie6Fixed()
13. };
14. //绑定事件
15. var __initEvent=function(){
16. $(window).resize(function(){
17. var winW=$(this).width();
18. if(winW<=1124){$("#pubFeedBack").hide()}
19. else{$("#pubFeedBack").show()}
20. });
21. $(window).bind("scroll",function(){
22. if($(this).scrollTop()>50){
23. $("#backTop").fadeIn().css({"display":"block"})
24. }
25. else{$("#backTop").fadeOut().css({"display":""})}
26. });
27. $("#backTop").bind("click",function(e){
28. e.preventDefault();
29. $("html,body").scrollTop(0)});
30. };
31. //回到顶部
32. var __tip=function(type,tipText){
33. var surveyTip=$("#D_SurveyTip"),surveyMask=$("#D_SurveyMask");
34. if(!surveyTip||!surveyMask){return}
35. surveyTip.removeClass("warning success").addClass(type).html(tipText);
36. surveyMask.css("display","block");
37. surveyTip.css("display","block");
38. setTimeout(function(){
39. surveyMask.css("display","none");                                                                                                                                                                                                                                                                                       surveyTip.css("display","none")},1000)
40. };
41. //ie6兼容
42. var __ie6Fixed=function(){
43. if(ieVersion!==6){return}
44. var surveyBox=$("#D_SurveyBox");
45. var pubFeedBack=$("#pubFeedBack");
46. if(!surveyBox||!pubFeedBack)
47. {
48. return
49. }
50. $(window).bind("scroll",function(){
51. var h=$(window).height(),st=$(window).scrollTop(),_top=h+st-options.height;                                                                                                                                                         var _top1=h+st-pubFeedBack.height()-15;surveyBox.css("top",_top+"px");
52. pubFeedBack.css("top",_top1+"px")
53. })
54. };
55. //开始执行
56. if(screen.width>=1280)
57. {
58. (function(){
59. __feedCreat();                                                                                                                                          __initEvent()                                                                                                                                                       })()
60. }
61. }
62. })(jQuery);
63. window.onerror=function(){return false};
64. if($.isFunction($(document).survey)){$(document).survey()}

1. #backTop i,#callSurvey i{background:url(survey.png) no-repeat;}
2. #pubFeedBack{position:fixed;_position:absolute;right:15px;bottom:15px;width:54px;font-size:12px;}
3. #backTop,#callSurvey{display:block;width:52px;padding:1px;height:56px;line-height:22px;text-align:center;color:#fff;text-decoration:none;}
4. #backTop{display:none;background:#999;}
5. #backTop:hover{background:#ccc;zoom:1;text-decoration:none;color:#fff;}
6. #backTop i{display:block;width:25px;height:13px;margin:14px auto 8px;background-position:-63px 0;}
7. #callSurvey{margin-top:1px;background:#3687d9;}
8. #callSurvey:hover{background:#66a4e3;zoom:1;text-decoration:none;color:#fff;}
9. #callSurvey i{display:block;width:26px;height:25px;margin:9px auto 0;background-position:0 0;}
10. #callSurvey:hover i{background-position:-30px 0;}