1、js

(function(win,doc){
  change();
  function change(){
    doc.documentElement.style.fontSize = doc.documentElement.clientWidth / 20 +‘px‘;
  }
  win.addEventListener(‘resize‘,change,false);
  win.addEventListener(‘orientationchange‘,change,false);  /* 這個是移動端設備橫屏、豎屏轉換時觸發的事件處理函數 */
})(window,document);
 

2、css

@media only screen and (width: 320px) {
    html {
        font-size: 8px;
    }
}

@media only screen and (width: 360px) {
    html {
        font-size: 9px;
    }
}

@media only screen and (width: 375px) {
    html {
        font-size: 9.375px;
    }
}

@media only screen and (width: 400px) {
    html {
        font
 
-size: 10px;
    }
}

@media only screen and (width: 411px) {
    html {
        font-size: 10.275px;
    }
}

@media only screen and (width: 10.3px) {
    html {
        font-size: 20.6px;
    }
}


@media only screen and (width: 414px) {
    html {
        font-size: 10.35px;
    }
}

@media only screen and (width: 768px) {
    html {
        font
 
-size: 19.2px;
    }
}

@media only screen and (width: 1024px) {
    html {
        font-size: 25.6px;
    }
}

屏幕自適應