如何实现移动端网页等比缩放的最佳初始化JavaScript代码？

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resize.js // 屏幕适配function(win) { function resize() { var domWidth=domEle.getBoundingClientRect().width; if (domWidth / v > 540) { domWidth=540 * v; } win.rem=domWidth / 37.5; domEle.style.fontSize=win.rem + px; } var v, initi;

resize.js

// 屏幕适配 !function(win) { function resize() { var domWidth = domEle.getBoundingClientRect().width; if(domWidth / v > 540){ domWidth = 540 * v; } win.rem = domWidth / 37.5; domEle.style.fontSize = win.rem + "px"; } var v, initial_scale, timeCode, dom = win.document, domEle = dom.documentElement, viewport = dom.querySelector('meta[name="viewport"]'), flexible = dom.querySelector('meta[name="flexible"]'); if (viewport) { //viewport： var o = viewport.getAttribute("content").match(/initial\-scale=(["']?)([\d\.]+)\1?/); if(o){ initial_scale = parseFloat(o[2]); v = parseInt(1 / initial_scale); } } else { if (flexible) { var o = flexible.getAttribute("content").match(/initial\-dpr=(["']?)([\d\.]+)\1?/); if(o){ v = parseFloat(o[2]); initial_scale = parseFloat((1 / v).toFixed(2)) } } } if (!v && !initial_scale) { var n = (win.navigator.appVersion.match(/android/gi), win.navigator.appVersion.match(/iphone/gi)); v = win.devicePixelRatio; v = n ? v >= 3 ? 3 : v >= 2 ? 2 : 1 : 1, initial_scale = 1 / v } //没有viewport标签的情况下 if (domEle.setAttribute("data-dpr", v), !viewport) { if (viewport = dom.createElement("meta"), viewport.setAttribute("name", "viewport"), viewport.setAttribute("content", "initial-scale=" + initial_scale + ", maximum-scale=" + initial_scale + ", minimum-scale=" + initial_scale + ", user-scalable=no"), domEle.firstElementChild) { domEle.firstElementChild.appendChild(viewport) } else { var m = dom.createElement("div"); m.appendChild(viewport), dom.write(m.innerHTML) } } win.dpr = v; win.addEventListener("resize", function() { clearTimeout(timeCode), timeCode = setTimeout(resize, 300) }, false); win.addEventListener("pageshow", function(b) { b.persisted && (clearTimeout(timeCode), timeCode = setTimeout(resize, 300)) }, false); resize(); }(window);