在前面head里面加上这一句禁止缩放：
<meta name="viewport"
content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">
以下是js代码 该代码1rem=100px ：
!(function(win, doc) {
function setFontSize() {
var winWidth = window.innerWidth;
doc.documentElement.style.fontSize = (winWidth / 1080) * 100 + 'px';
}
var evt = 'onorientationchange' in win ? 'orientationchange' : 'resize';
var timer = null;
win.addEventListener(evt, function() {
clearTimeout(timer);
timer = setTimeout(setFontSize, 300);
}, false);
win.addEventListener("pageshow", function(e) {
if (e.persisted) {
clearTimeout(timer);
timer = setTimeout(setFontSize, 300);
}
}, false);
//初始化
setFontSize();
}(window, document));