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javascript中返回顶部按钮的实现

作者:佚名    责任编辑:admin    更新时间:2022-06-22

 炫酷的返回顶部功能

js核心代码

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 window.onscroll = function(){ var t = document.documentElement.scrollTop || document.body.scrollTop; var top_div = document.getElementById( "go" ); if( t >= 300 ) { top_div.style.display = "block"; } else { top_div.style.display = "none"; } }     var ptt=20; function pageScroll() {   document.getElementById('flypig').style.display='block'; window.scrollBy(0,-10); //每次上升10px       if(document.body.scrollTop==0) { document.getElementById('flypig').style.marginBottom=ptt+'px'; ptt=ptt+10; } scrolldelay = setTimeout('pageScroll()',2); //2毫秒重复执行一次   if(ptt>=1000){ ptt=0; document.getElementById('flypig').style.marginBottom=20+'px'; document.getElementById('flypig').style.display='none'; clearTimeout(scrolldelay); } //pageScroll ends }

html

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 <!DOCTYPE html> <html> <head> <title>返回顶部按钮的实现</title> <meta charset="utf-8" /> <style> body{ margin:0px; } #flypig{ display: none; float: left; position: fixed; bottom: 20px; margin-left: 75%; cursor: pointer; margin-bottom: 20px; } #go{ display: block; float: left; position: fixed; bottom: 10px; margin-left: 75%; cursor: pointer; } </style> <script>   window.onscroll = function(){ var t = document.documentElement.scrollTop || document.body.scrollTop; var top_div = document.getElementById( "go" ); if( t >= 300 ) { top_div.style.display = "block"; } else { top_div.style.display = "none"; } }   var ptt=20; function pageScroll() {   document.getElementById('flypig').style.display='block'; window.scrollBy(0,-10); //每次上升10px   if(document.body.scrollTop==0) { document.getElementById('flypig').style.marginBottom=ptt+'px'; ptt=ptt+10; } scrolldelay = setTimeout('pageScroll()',2); //2毫秒重复执行一次   if(ptt>=1000){ ptt=0; document.getElementById('flypig').style.marginBottom=20+'px'; document.getElementById('flypig').style.display='none'; clearTimeout(scrolldelay); } //pageScroll ends }   </script> </head> <body> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <h1 style="text-align:center;">请往下滑</h1> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /><br /> <br /> <br /> <br /> <br /><br /> <br /> <br /> <br /> <br /><br /> <br /> <br /> <br /> <br /><br /> <br /> <br /> <br /> <br /> <br />