下边有两种方法,原理是一样的,就是写法上,有稍微的不同。
第一种:
(function (doc, win) {
var docEl = doc.documentElement,
isIOS = navigator.userAgent.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/),
dpr = isIOS? Math.min(win.devicePixelRatio, 3) : 1,
dpr = window.top === window.self? dpr : 1, //被iframe引用时,禁止缩放
dpr = 1,
scale = 1 / dpr,
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
docEl.dataset.dpr = dpr;
var metaEl = doc.createElement('meta');
metaEl.name = 'viewport';
metaEl.content = 'initial-scale=' + scale + ',maximum-scale=' + scale + ', minimum-scale=' + scale;
docEl.firstElementChild.appendChild(metaEl);
var recalc = function () {
var width = docEl.clientWidth;
if (width / dpr > 750) {
width = 750 * dpr;
}
docEl.style.fontSize = 100 * (width / 750) + 'px';
};
recalc();
if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
})(document, window);
第二种:
(function($){
var main={
init:function(){
this.auto()
},
auto:function(){
var num = 1/window.devicePixelRatio;
var meta = document.createElement('meta');
meta.name="viewport";
meta.content='width=device-width, user-scalable=no, initial-scale='+num+', maximum-scale='+num+', minimum-scale='+num;
document.body.appendChild(meta);
var fontSize = document.documentElement.clientWidth/10;
document.documentElement.style.fontSize = fontSize+'px';
/*var scale = 1/window.devicePixelRatio;
$(document.body).append('')
$('html').css('font-size',parseInt($(window).width()/10));*/
return this;
}
};
main.init();
})(jQuery);