请问如何通过 javascript 判断 url 以打开不同大小的窗口？

Question

$('#playlistulli>a').click(function(){if(href.indexOf("tudou.com")!==-1){window.open(this.href,"","top=100,left=355,width=640,height=500");}else{window.open(this.href,"","top=284,left=370,width=610,height=290");}returnfalse;});这样写无法实现。。求助