页面自适应

// 自适应
function autoScreen(){
    var font_size = 40;
    var col_num = 640 / font_size;
    var adapterSize = window.innerWidth / col_num;
    var htmlElement = document.getElementsByTagName("html")[0];
    htmlElement.style.fontSize = '' + adapterSize + 'px';
    
    window.onresize=function (){
        adapterSize = window.innerWidth / col_num;
        htmlElement.style.fontSize = '' + adapterSize + 'px';
    }
};
autoScreen();