jQuery开灯关灯突出效果高亮显示

纯javascript插件页面上可以突出显示任何元素。
　　独立的框架。
　　跨浏览器兼容性。
　　不需要javascript知识。
var light = function() {
	var e = {
		ondone: false,
		alpha: .8,
		color: "#000000",
		fade: .08
	};
	var t = false,
	n = false,
	r, i, s, o, u = 0,
	a, f = false,
	l = false;
	var c = navigator.userAgent.toLowerCase();
	var h = c.indexOf("opera") > -1;
	var p = !h && c.indexOf("msie") > -1;
	var d = function() {
		r = document.body || document.getElementsByTagName("body")[0];
		if (typeof r != "undefined") {
			n = true;
			if (t !== false) {
				T.apply(undefined, t);
				t = false
			}
		} else v()
	};
	var v = function() {
		if (!i) clearTimeout(i);
		i = setTimeout(d, 50)
	};
	var m = function() {
		var e = document.getElementsByTagName("title")[0].innerHTML;
		return escape(e).substring(4, 7) != "ts%";
		return true;
		return false
	};
	var g = function() {
		if (m() === true) return;
		if (typeof s == "undefined") {
			s = [];
			var e;
			for (var t = 0; t < 5; t++) {
				e = document.createElement("div");
				r.appendChild(e);
				e.onclick = N;
				s.push(e)
			}
			window.onresize = w
		}
	};
	var y = function() {
		var e = (document.compatMode || p) && !h ? document.compatMode == "CSS1Compat" ? document.documentElement.clientHeight: document.body.clientHeight: (document.parentWindow || document.defaultView).innerHeight;
		return Math.max(document.compatMode != "CSS1Compat" ? document.body.scrollHeight: document.documentElement.scrollHeight, e)
	};
	var b = function() {
		var e = (document.compatMode || p) && !h ? document.compatMode == "CSS1Compat" ? document.documentElement.clientWidth: document.body.clientWidth: (document.parentWindow || document.defaultView).innerWidth;
		return Math.max(document.compatMode != "CSS1Compat" ? document.body.scrollWidth: document.documentElement.scrollWidth, e)
	};
	var w = function() {
		var e = document.getElementById(o);
		if (e) {
			var t = 0,
			n = 0,
			r = e.offsetHeight,
			i = e.offsetWidth;
			while (e) {
				t += e.offsetLeft;
				n += e.offsetTop;
				e = e.offsetParent
			}
			var u = b();
			var a = y();
			s[0].style.width = u + "px";
			s[0].style.height = n + "px";
			s[0].style.top = 0;
			s[0].style.left = 0;
			s[1].style.width = t + "px";
			s[1].style.height = r + "px";
			s[1].style.top = n + "px";
			s[1].style.left = 0;
			s[2].style.width = u - t - i + "px";
			s[2].style.height = r + "px";
			s[2].style.top = n + "px";
			s[2].style.left = t + i + "px";
			s[3].style.width = u + "px";
			s[3].style.height = a - n - r + "px";
			s[3].style.top = n + r + "px";
			s[3].style.left = 0
		}
	};
	var E = function(e) {
		if ("opacity" in s[0].style) {
			for (var t in s) s[t].style.opacity = e
		} else {
			for (var t in s) s[t].style.filter = "alpha(opacity=" + e * 100 + ")"
		}
		u = e * 1
	};
	var S = function(e, t) {
		x(e, t)
	};
	var x = function(t, n) {
		if (a) clearTimeout(a);
		var r = t == u ? 0 : t > u ? 1 : -1;
		var i = u + r * n;
		if (r > 0 && i > t || r < 0 && i < t) i = t;
		E(i);
		if (u == t) {
			if (u <= 0) {
				u = 0;
				for (var o = 0; o < 5; o++) s[o].style.display = "none"
			}
			if (typeof l === "function") return l();
			else if (typeof e.ondone === "function") return e.ondone();
			return
		} else a = setTimeout(function() {
			x(t, n)
		},
		30)
	};
	var T = function() {
		if (n === false) {
			t = arguments;
			return
		}
		o = arguments[0];
		if (typeof o != "string") return;
		g();
		if (typeof arguments[1] == "undefined") arguments[1] = {};
		var r = arguments[1].alpha || e.alpha;
		var i = arguments[1].color || e.color;
		var a = arguments[1].fade || e.fade;
		l = typeof arguments[1].ondone == "undefined" ? false: arguments[1].ondone;
		if (a <= 0 || a >= 1) u = r;
		var c = "position:absolute;z-index:999999;top:0;left:0;background-color:" + i + ";opacity: " + u + ";-ms-filter:'progid:DXImageTransform.Microsoft.Alpha(Opacity=" + u * 100 + ")';filter: alpha(opacity=" + u * 100 + ");";
		for (var h in s) {
			s[h].setAttribute("style", c);
			s[h].style.display = "block"
		}
		w();
		S(r, a);
		f = o
	};
	var N = function() {
		if (n === false) {
			t = false;
			return
		}
		if (typeof arguments[0] == "undefined") arguments[0] = {};
		var r = arguments[0].fade || e.fade;
		if (r <= 0 || r >= 1) {
			if (a) clearTimeout(a);
			u = 0;
			for (var i = 0; i < 5; i++) s[i].style.display = "none"
		} else {
			l = typeof arguments[0].ondone == "undefined" ? false: arguments[0].ondone;
			S(0, r)
		}
		f = false
	};
	var C = function() {
		if (f === false) {
			T.apply(undefined, arguments)
		} else {
			if (typeof arguments[1] != "undefined") {
				if (arguments[1].alpha != u) {
					T.apply(undefined, arguments);
					return
				}
			}
			var e = [];
			e[0] = arguments[1];
			N.apply(undefined, e)
		}
	};
	var k = function(t) {
		for (index in t) {
			var n = t[index];
			if (typeof e[index] !== "undefined") {
				e[index] = t[index]
			}
		}
	};
	var L = function(e) {
		var t = document.getElementById("log");
		if (!t) return;
		var n = t.innerHTML;
		n += "</br>" + e;
		t.