js判断移动端字体尺寸
(function (root) {
var docEl = document.documentElement,
timer = null,
width, last;
function changeRem () {
width = docEl.getBoundingClientRect().width;
if (last === width) { return; }
last = width;
root.rem = (width / 640) * 100;
if (/ZTE U930_TD/.test(navigator.userAgent)) {
root.rem = root.rem * 1.13;
}
docEl.style.fontSize = root.rem + 'px';
}
changeRem();
root.addEventListener('resize', function () {
clearTimeout(timer);
timer = setTimeout(changeRem, 300);
});
root.addEventListener('orientationchange', function () {
clearTimeout(timer);
timer = setTimeout(changeRem, 300);
});
})(window, undefined);
js判断微信浏览器
我们知道 js 可以通过 window.navigator.userAgent 来获取浏览器的相关信息,比如:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36,那么我们也可以通过该方法来获取微信内置浏览器的相关信息:Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Mobile/11d201 MicroMessenger/5.3。根据关键字 MicroMessenger 来判断是否是微信内置的浏览器。判断函数如下:
function isWeiXin(){
var ua = window.navigator.userAgent.toLowerCase();
if(ua.match(/MicroMessenger/i) == 'micromessenger'){
return true;
}else{
return false;
}
}
参考资料:https://lee134134134.github.io/page/10/