jQuery leonaScroll 1.1 自定义滚动条插件(推荐)

$("head").append("<style type='text/css'>" + scrollStyle + "</style>");
//变量声明
var text_show = $(celem).height(), scroll_b = $(".leonabutton" + index + ""), text_p = text_hidden / text_show, bH_max = $(".leonas" + index + " .leonacen" + index + "").height(), bH = text_p * bH_max;
if (parameter.scrollbar == true || parameter.scrollbar === undefined) {
if (text_p >= 1) $(".leonas" + index + "").css("display", "none"); else { $(".leonas" + index + "").css("display", "block"); scroll_b.css("height", bH + "px"); }
} else return;

//鼠标拖动div事件
var needMove = false, mouseY = 0;
scroll_b.mousedown(function (event) { needMove = true; var bH_Top = scroll_b.position().top; mouseY = event.pageY - bH_Top; });
$(document).mouseup(function (event) { needMove = false; });
$(document).mousemove(function (event) {
if (needMove) {
var sMouseY = event.pageY, bH_Top = sMouseY - mouseY, textY = bH_Top / bH_max * text_show;
if (bH_Top <= 0) scroll_b.css("top", 0); $(celem).css("top", 0); return;
if (bH_Top >= bH_max - bH) scroll_b.css("top", bH_max - bH); $(celem).css("top", text_hidden - text_show); return;
scroll_b.css("top", bH_Top); $(celem).css("top", -textY);
} return;
});
//定义上下滚动规则
function goGun(direction, timer) {
bH_Top = scroll_b.position().top;
var h = 0; h += parameter.speed; //调节滑动速度
if (direction == 1) { //up
var Toping = bH_Top - h;
if (bH_Top <= 0 || Toping <= 0) {
scroll_b.css("top", 0); $(celem).css("top", 0);
if (timer == 2) clearInterval(goThread); //need timer
return;
}
scroll_b.css("top", bH_Top - h);
};
if (direction == -1) { //down
var Downing = bH_Top + h;
if (bH_Top >= bH_max - bH || Downing >= bH_max - bH) {
scroll_b.css("top", bH_max - bH);
$(celem).css("top", text_hidden - text_show);
if (timer == 2) clearInterval(goThread); //need timer
return;
}
scroll_b.css("top", bH_Top + h);
}
var textY = bH_Top / bH_max * text_show;
$(celem).css("top", -textY);
};
//上下微调按钮事件
function minTiao(minTB, d, t) {
var goThread = "";
minTB.mouseup(function () { clearInterval(goThread); });
minTB.mousedown(function () {
clearInterval(goThread);
goThread = setInterval(function () { goGun(d, t); }, 300);
});
minTB.click(function () { goGun(d); });
};
minTiao($(".leonaup" + index + ""), 1, 2);//up
minTiao($(".leonadown" + index + ""), -1, 2);//down
//滚轮事件
if (text_p < 1) {
$(elem).bind("mousewheel", function (event, delta, deltaX, deltaY) {
if (delta == 1) {//up
goGun(1, 0);
if (scroll_b.position().top != 0)
return false;
} if (delta == -1) {//down
goGun(-1, 0);
if (Math.ceil(scroll_b.position().top) != Math.ceil(bH_max - bH))
return false;
}
});
}
});
}
});