在屏幕上居中显示弹出窗口？

更新：它现在也可以在尚未超出屏幕宽度和高度的窗口上运行！

如果您使用双显示器，则窗口将水平居中，而不是垂直居中…使用此功能可以解决此问题。

const popupCenter = ({url, title, w, h}) => {    // Fixes dual-screen position       Most browsers      Firefox    const dualScreenLeft = window.screenLeft !==  undefined ? window.screenLeft : window.screenX;    const dualScreenTop = window.screenTop !==  undefined   ? window.screenTop  : window.screenY;    const width = window.innerWidth ? window.innerWidth : document.documentElement.clientWidth ? document.documentElement.clientWidth : screen.width;    const height = window.innerHeight ? window.innerHeight : document.documentElement.clientHeight ? document.documentElement.clientHeight : screen.height;    const systemZoom = width / window.screen.availWidth;    const left = (width - w) / 2 / systemZoom + dualScreenLeft    const top = (height - h) / 2 / systemZoom + dualScreenTop    const newWindow = window.open(url, title,       `      scrollbars=yes,      width=${w / systemZoom},       height=${h / systemZoom},       top=${top},       left=${left}      `    )    if (window.focus) newWindow.focus();}

用法示例：

popupCenter({url: 'http://www.xtf.dk', title: 'xtf', w: 900, h: 500});