jQuery制作全屏宽度固定高度轮播图(实例讲解)

 *{ margin: 0; padding: 0; } .cm-banner { width: 100%; height: 300px; overflow: hidden; cursor: pointer; position: relative; } .cm-banner-in { width: 1100px; height: 300px; position: absolute; top: 0; left: 50%; margin-left: -550px; } #cm_banner_list li{ display: none; position: absolute; top: 0; left: 0; } .cm-banner-num { width: 100%; position: absolute; bottom: 0; text-align: center; z-index: 2; /*如果没有在这里设置层次小圆点的点击效果无法触发*/ } .cm-banner-num li{ width: 10px; margin: 10px 3px; height: 10px; background-color: #fff; border-radius: 5px; -webkit-border-radius: 5px; display: inline-block; opacity: 0.7; } .cm-banner-num .active { background-color: #3982de; } .cm-banner-arrow { position: absolute; top: 50%; margin-top: -22px; opacity: 0.5; display: none; } #cm_prev { left: 0; } #cm_next { right: 0; }

 $(function(){ //鼠标移入显示箭头按钮 $('.cm-banner').hover(function(){ $('.cm-banner-arrow').show(); clearInterval(cm_timer); },function(){ $('.cm-banner-arrow').hide(); cm_timer = setInterval(function(){ i++; if(i > cm_length - 1){ i = 0; } $('#cm_banner_list li').eq(i).fadeIn(800).siblings().fadeOut(800); cm_toggle(i); },2500); }); //鼠标移入箭头按钮高亮 $('.cm-banner-arrow').hover(function(){ $(this).css('opacity','1'); },function(){ $(this).css('opacity','0.5'); }); //初始化必要变量 var i = 0; var cm_length = $('#cm_banner_list li').length; var cm_toggle = function(point){ $('#cm_banner_num li').eq(point).addClass('active').siblings().removeClass('active'); }; //动态添加小圆点 for(j = 0;j '); } //给第一个小圆点添加样式 $('#cm_banner_num li').first().addClass('active'); //给第一张图片添加样式 $('#cm_banner_list li').first().css('display','block'); //鼠标点击左箭头切换 $('#cm_prev').click(function(){ i--; if(i <0){ i = cm_length - 1; } $('#cm_banner_list li').eq(i).fadeIn(800).siblings().fadeOut(800); cm_toggle(i); }); //鼠标点击右箭头切换 $('#cm_next').click(function(){ i++; if(i > cm_length - 1){ i = 0; } $('#cm_banner_list li').eq(i).fadeIn(800).siblings().fadeOut(800); cm_toggle(i); }); //鼠标点击圆点切换 $('#cm_banner_num li').click(function(){ var cm_index = $(this).index(); $('#cm_banner_list li').eq(cm_index).fadeIn(800).siblings().fadeOut(800); i = cm_index; cm_toggle(cm_index); }); //自动播放 cm_timer = setInterval(function(){ i++; if(i > cm_length - 1){ i = 0; } $('#cm_banner_list li').eq(i).fadeIn(800).siblings().fadeOut(800); cm_toggle(i); },2500); });