在iframe里拿父窗口信息

var findParentWin = function(url) {

var parentWin = null;

var fs = window.parent.frames;

for (var i = 0; i < fs.length; i++) {

var loc = fs[i].location.href;

if (loc && loc.indexOf(url) != -1) {

parentWin = fs[i];

break;

}

}

return parentWin;

};