1. 簡單入門的rem適配方案，純CSS實(shí)現(xiàn)

html{

font-size:20px;

}

@mediaonlyscreenand(min-width:401px) {

html{

font-size:21.33333333px!important;

}

}

@mediaonlyscreenand(min-width:414px) {

html{

font-size:22.08px!important;

}

}

@mediaonlyscreenand(min-width:480px) {

html{

font-size:25.6px!important;

}

}

body{

font-size:16px;

}