fixedWebview.js

var trys = 0;
function pageInit(){
    var imgW = 695,
        imgH = 1033,
        wW = window.innerWidth,
        wH = window.innerHeight,
        _imgW, _imgH,
        picbg = document.getElementById('picbg'),
        px2rem = function(px){
            return px/(imgW/10);
        };

    if (imgW/imgH > wW/wH) {
        _imgW = wW;
        _imgH = imgH/imgW * wW;
        document.documentElement.style.fontSize = _imgW/10+'px';
    }else{
        _imgH = wH;
        _imgW = imgW/imgH * wH;
        document.documentElement.style.fontSize = _imgW/10+'px';
    }

    picbg.style.width = px2rem(imgW) + 'rem';
    picbg.style.height = px2rem(imgH) + 'rem';

    if (wW/wH>1.1 && trys<100) {
      setTimeout(function(){
        trys++;
        pageInit();
      },10)
    }
}
window.onload = function(){
    pageInit();
};