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$(function() {
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var len = $("#focus ul li").length; //获取焦点图个数
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var index = 0;
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var picTimer;
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//以下代码添加数字按钮和按钮后的半透明条，还有上一页、下一页两个按钮
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var btn = "<div class='btnBg'><div class='btn'>";
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for(var i=0; i < len; i++) {
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btn += "<span></span>";
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}
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btn += "</div></div><div class='preNext pre'></div><div class='preNext next'></div>";
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$("#focus").append(btn);
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//$("#focus .btnBg").css("opacity",0.5);
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//为小按钮添加鼠标滑入事件，以显示相应的内容
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$("#focus .btn span").addClass("on").mouseover(function() {
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index = $("#focus .btn span").index(this);
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showPics(index);
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}).eq(0).trigger("mouseover");
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//上一页、下一页按钮透明度处理
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$("#focus .preNext").css("opacity",0.5).hover(function() {
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$(this).stop(true,false).animate({"opacity":"0.9"},300);
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},function() {
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$(this).stop(true,false).animate({"opacity":"0.5"},300);
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});
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//上一页按钮
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$("#focus .pre").click(function() {
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index -= 1;
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if(index == -1) {index = len - 1;}
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showPics(index);
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});
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//下一页按钮
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$("#focus .next").click(function() {
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index += 1;
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if(index == len) {index = 0;}
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showPics(index);
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});
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//鼠标滑上焦点图时停止自动播放，滑出时开始自动播放
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$("#focus").hover(function() {
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clearInterval(picTimer);
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},function() {
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picTimer = setInterval(function() {
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showPics(index);
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index++;
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if(index == len) {index = 0;}
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},4000); //此4000代表自动播放的间隔，单位：毫秒
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}).trigger("mouseleave");
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//显示图片函数，根据接收的index值显示相应的内容
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function showPics(index) { //普通切换
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$("#focus li").stop(true,false).animate({"opacity":"0"},500);
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$("#focus li:eq("+index+")").stop(true,false).animate({"opacity":"1"},500);
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$("#focus .btn span").removeClass("on").eq(index).stop(true,false).addClass("on"); //为当前的按钮切换到选中的效果
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}
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/*登陆框隐藏*/
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$('.close').click(function(){
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$('.login').hide(200);
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$('#screen').remove();
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});
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});
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