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
, V) ~- ]* A5 C7 p) Q复制代码 代码如下:
h. b+ \% `- R' c1 F<script language=javascript>
' B7 t8 y# f7 T( qvar goto_top_type = -1;
0 e7 U9 M* d, uvar goto_top_itv = 0;6 i7 ^. u% @4 h8 K" |) m& u
function goto_top_timer() {$ T" a1 n$ P0 t
var y = goto_top_type == 1 ? document.documentelement.scrolltop
6 v2 Z8 ?; b( h9 c- C1 ]! ^7 D2 R: document.body.scrolltop;
' [4 s; l" q/ Mvar moveby = 15;" D9 {2 d9 Q5 e# g& Y
y -= math.ceil(y * moveby / 100);7 s4 Z$ d# Y5 w% v* e% e) o
if (y < 0) {
7 H) w b5 i5 R- n; Zy = 0;
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if (goto_top_type == 1) {" d) _2 L* P5 D }% L. z5 I4 p
document.documentelement.scrolltop = y;
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document.body.scrolltop = y;; B! Y, Y) d, |5 ~! q
}
6 ?0 L; }" f9 o5 C @ k" fif (y == 0) {
8 ?4 L1 F3 K3 p e( b2 X9 ^5 e0 Q. |clearinterval(goto_top_itv);1 J; C( r4 w% [$ k
goto_top_itv = 0;
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function goto_top() {: ^$ o8 o" i$ n6 g
if (goto_top_itv == 0) {
9 H' U/ Q2 g1 i: ]/ kif (document.documentelement && document.documentelement.scrolltop) {
* o$ m9 q% K$ D' x, f7 agoto_top_type = 1;6 {. T- c! U( a1 p" C
} else if (document.body && document.body.scrolltop) {
( H! u+ B8 z5 G0 a7 fgoto_top_type = 2;
. B x) d4 ?0 F} else {% G( h* r7 ~8 O. a! d
goto_top_type = 0;
' F0 @* m8 t) ?- y) b9 e0 L}
e7 ?: g; V! W# i( N/ R) ]! X9 tif (goto_top_type > 0) {
$ x3 c1 E8 z# s8 _goto_top_itv = setinterval('goto_top_timer()', 50);: i( P; n" q7 y
} p' G# ~* @. I% G; |
}
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7 W* ?$ T3 g! Y& l) V" R</script>, L% P# ~' r. S* y2 \$ z% T
<a href=javascript:void(0) onclick=goto_top()>【返回顶部】</a>: K- d7 I! g/ s( g5 z
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