手机端写代码，全适应scale。等比例缩放整个页面
写了一套手机端代码，全部字体等比例缩放，很牛叉的一个js代码，单位是PX，没有用em和rem
var view_timer = null;
function viewPort(userAgent, pageWidth) {
var oView = document.getElementById('viewport');
if (oView) {
document.head.removeChild(oView);
}
if (!pageWidth) {
pageWidth = 750;
}
var screen_w = parseInt(window.screen.width),
scale = screen_w / pageWidth;
if (/Android (\d+\.\d+)/.test(userAgent)) {
var creat_meta = document.createElement('meta');
creat_meta.name = 'viewport';
creat_meta.id = 'viewport';
var version = parseFloat(RegExp.$1);
if (version > 2.3) {
creat_meta.content = 'width=' + pageWidth + ', initial-scale = ' + scale + ',user-scalable=1, minimum-scale = ' + scale + ', maximum-scale = ' + scale + ', target-densitydpi=device-dpi';
} else {
creat_meta.content = '"width=' + pageWidth + ', target-densitydpi=device-dpi';
}
document.head.appendChild(creat_meta);
} else {
var creat_meta = document.createElement('meta');
creat_meta.name = 'viewport';
creat_meta.id = 'viewport';
if(window.orientation=='-90' || window.orientation == '90'){
scale = window.screen.height / pageWidth;
creat_meta.content = 'width=' + pageWidth + ', initial-scale = ' + scale + ' ,minimum-scale = ' + scale + ', maximum-scale = ' + scale + ', user-scalable=no, target-densitydpi=device-dpi';
}
else{
creat_meta.content = 'width=' + pageWidth + ', initial-scale = ' + scale + ' ,minimum-scale = ' + scale + ', maximum-scale = ' + scale + ', user-scalable=no, target-densitydpi=device-dpi';
}
document.head.appendChild(creat_meta);
}
}
viewPort(navigator.userAgent);
window.onresize = function() {
clearTimeout(view_timer);
view_timer = setTimeout(function(){
viewPort(navigator.userAgent);
}, 500);
}
