居中 window.open 与 window.showModalDialog

var iWidth = window.screen.availWidth - 350; //弹出窗口的宽度;

var iHeight = window.screen.availHeight - 350; //弹出窗口的高度;

var iTop = (window.screen.availHeight - 30 - iHeight) / 2; //获得窗口的垂直位置;

var iLeft = (window.screen.availWidth - 10 - iWidth) / 2; //获得窗口的水平位置;

var isChrome = window.navigator.userAgent.indexOf("Chrome") !== -1;

if (isChrome) {

window.open(url, name, 'height=' + iHeight + ',width=' + iWidth + ',top=' + iTop + ',left=' + iLeft + ',toolbar=no,menubar=no,scrollbars=yes, resizable=no,location=no,status=no')

} else {

window.showModalDialog(url, name, "dialogWidth=" + iWidth + "px;dialogHeight=" + iHeight + "px;dialogLeft=" + iLeft + "px");

}