js實現鼠標感應向下滑動隱藏菜單的方法

2019-11-20 13:08:27

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來源：轉載

供稿：網友

本文實例講述了js實現鼠標感應向下滑動隱藏菜單的方法。分享給大家供大家參考。具體實現方法如下：

<html>
<head>
<title>隱藏在網頁左上角感應鼠標向下滑出的隱藏菜單</title>
<style>#D1 {
    BACKGROUND-COLOR: blue;
    BORDER-BOTTOM: white 2px outset;
    BORDER-LEFT: white 2px outset;
    BORDER-RIGHT: white 2px outset;
    BORDER-TOP: white 2px outset;
    LEFT: 0px; POSITION: absolute;
    TOP: 0px; VISIBILITY: hidden;
    WIDTH: 300px;
    layer-background-color: lightgreen
}
a{font-size:9pt;color:#000000}
a:link{text-decoration:none}
a:hover{text-decoration:none;color:#FFFFFF}
a:visited{text-decoration:none}
.40pt{font-size:40pt;color:#ub39a1;font-family:文鼎琥珀繁}
</style>
<script language="javascript">
function menuIn() //菜單隱藏
{
        if(n4) {
                clearTimeout(out_ID)
                if( menu.top > menuH*-1+20+10 ) {
                        menu.top -= 8
                        in_ID = setTimeout("menuIn()", 1)
                }
                else if( menu.top > menuH*-1+20 ) {
                        menu.top--
                        in_ID = setTimeout("menuIn()", 1)
                }
        }
        else {
                clearTimeout(out_ID)
                if( menu.pixelTop > menuH*-1+20+10 ) {
                        menu.pixelTop -= 8
                        in_ID = setTimeout("menuIn()", 1)
                }
                else if( menu.pixelTop > menuH*-1+20 ) {
                        menu.pixelTop--
                        in_ID = setTimeout("menuIn()", 1)
                }
        }
}
function menuOut() //菜單顯示
{
        if(n4) {
                clearTimeout(in_ID)
                if( menu.top < -10) {
                        menu.top += 4
                        out_ID = setTimeout("menuOut()", 1)
                }
                else if( menu.top < 0) {
                        menu.top++
                        out_ID = setTimeout("menuOut()", 1)
                }

        }
        else {
                clearTimeout(in_ID)
                if( menu.pixelTop < -10) {
                        menu.pixelTop += 2
                        out_ID = setTimeout("menuOut()", 1)
                }
                else if( menu.pixelTop < 0 ) {
                        menu.pixelTop++
                        out_ID = setTimeout("menuOut()", 1)
                }
        }
}
function fireOver() {
        clearTimeout(F_out)
        F_over = setTimeout("menuOut()", 10)
}
function fireOut() {
        clearTimeout(F_over)
         F_out = setTimeout("menuIn()", 10)
}
function init() {
        if(n4) {
                menu = document.D1
                menuH = menu.document.height
                menu.top = menu.document.height*-1+20
                menu.onmouseover = menuOut
                menu.onmouseout = menuIn
        menu.visibility = "visible"
        }
        else if(e4) {
                menu = D1.style
                menuH = D1.offsetHeight
                D1.style.pixelTop = D1.offsetHeight*-1+20
                D1.onmouseover = fireOver
                D1.onmouseout = fireOut
                D1.style.visibility = "visible"
        }
}
F_over=F_out=in_ID=out_ID=null
n4 = (document.layers)?1:0
e4 = (document.all)?1:0;
</script>
</head>