1.通过定位实现
<style>
*{
margin: 0;
padding: 0;
}
div{
100%;
height: 100%;
background: yellow;
position: absolute;
}
</style>
<body>
<div></div>
</body>
2.通过设置html,body的宽高来让div充满屏幕
<style>
*{
margin: 0;
padding: 0;
}
html,body{
100%;
height: 100%;
}
div{
100%;
height: 100%;
background: yellow;
}
</style>
<body>
<div></div>
</body>