WordPress增加返回顶部效果的方法

//<![CDATA[
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);
}
}
}
//]]>
第二步:在主题文件style.css文件中加入以下样式:

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