调用方法的变量未定义

Chrome 37+禁用对showModalDialog的默认支持。

if(navigator.userAgent.indexOf("Chrome") >0 ){
var winOption = "height="+height+",width="+width+",top=50,left=50,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,fullscreen=0";
    	return  window.open(url,window, winOption);
}
else{
    return window.showModalDialog(url, window, 'dialogHeight: ' + height + 'px; dialogWidth: ' + width + 'px;edge: Raised; center: Yes; help: Yes;scroll:no; resizable: no; status: no;resizable:yes');
}  

window.showModalDialog 在谷歌Uncaught TypeError: undefined is not a function