这篇文章介绍了纯文字版返回顶端的js代码,有需要的朋友可以参考一下
复制代码 代码如下:
<script language=javascript>
var goto_top_type = -1;
var goto_top_itv = 0;
function goto_top_timer() {
var y = goto_top_type == 1 ? document.documentelement.scrolltop
: document.body.scrolltop;
var moveby = 15;
y -= math.ceil(y * moveby / 100);
if (y < 0) {
y = 0;
}
if (goto_top_type == 1) {
document.documentelement.scrolltop = y;
} else {
document.body.scrolltop = y;
}
if (y == 0) {
clearinterval(goto_top_itv);
goto_top_itv = 0;
}
}
function goto_top() {
if (goto_top_itv == 0) {
if (document.documentelement && document.documentelement.scrolltop) {
goto_top_type = 1;
} else if (document.body && document.body.scrolltop) {
goto_top_type = 2;
} else {
goto_top_type = 0;
}
if (goto_top_type > 0) {
goto_top_itv = setinterval('goto_top_timer()', 50);
}
}
}
</script>
<a href=javascript:void(0) onclick=goto_top()>【返回顶部】</a>
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