div点击外面隐藏

$(document).mouseup(function(e) {
        var cityContainer = $("#hiddenDiv");
        var townContainer = $("#townList");
        if (!cityContainer.is(e.target) // if the target of the click isn't the container...
                && cityContainer.has(e.target).length === 0) // ... nor a descendant of the container
        {
            cityContainer.hide();
        }

        if (!townContainer.is(e.target) // if the target of the click isn't the container...
                && townContainer.has(e.target).length === 0) // ... nor a descendant of the container
        {
            townContainer.hide();
        }
    });