var view_timer = null function viewPort(userAgent, pageWidth) { var oView = document.getElementById('viewport') if (oView) { document.head.removeChild(oView) } if (!pageWidth) { pageWidth = 750//手机页面设计图的宽度，宽度多少设置多少 } 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') {//判断移动设备横屏竖屏 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) }
项目引入即可
来源：博客园
作者：ronle
链接：https://www.cnblogs.com/ronle/p/11451370.html