iOS设备：
text-size-adjust: none !important;
-webkit-text-size-adjust: 100% !important;
-ms-text-size-adjust: 100% !important;
-moz-text-size-adjust: 100% !important;
安卓设备：
(function() {
if (typeof WeixinJSBridge == "object" && typeof WeixinJSBridge.invoke == "function") {
handleFontSize();
} else {
if (document.addEventListener) {
document.addEventListener("WeixinJSBridgeReady", handleFontSize, false);
} else if (document.attachEvent) {
//IE浏览器，非W3C规范
document.attachEvent("onWeixinJSBridgeReady", handleFontSize);
}
}
function handleFontSize() {
// 设置网页字体为默认大小
WeixinJSBridge.invoke('setFontSizeCallback', {
'fontSize': 0
});
// 重写设置网页字体大小的事件
WeixinJSBridge.on('menu:setfont', function() {
WeixinJSBridge.invoke('setFontSizeCallback', {
'fontSize': 0
});
});
}
})();