html頁面動態縮放/meta viewport/viewport，metaviewport

html頁面動態縮放/meta viewport/viewport，metaviewport

<meta id="viewport" name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no"><script type="text/javascript">    var winW = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, viewport = document.getElementById("viewport"), scale = 1;    if (winW <= 320) {        scale = winW / 375.00;    }    else if (winW < 395) {        scale = (winW - 20) / 375.00;    }    if (winW < 395) {        viewport.content = 'width=device-width,initial-scale=' + scale + ',maximum-scale=' + scale + ',minimum-scale=' + scale + ',user-scalable=no';    }</script>