<body style="background:url(images/bg.jpg) center top no-repeat;background-size: cover; background-attachment: fixed;">
谷歌浏览器用 background-size: cover 就可以了，但ie浏览器必须再加上 background-attachment: fixed 才生效
<body style="background:url(images/bg.jpg) center top no-repeat;background-size: cover; background-attachment: fixed;">
谷歌浏览器用 background-size: cover 就可以了，但ie浏览器必须再加上 background-attachment: fixed 才生效