jquery hidden div several ways

// jQuery display, concealment methods

$ ( "# id") show (); // expressed Run the display:. Block,
    $ ( "# the above mentioned id") hide (); // expressed Run the display:. none;
    . $ ( "# the above mentioned id") Toggle (); // visible state of the switching element. If the element is visible, the hidden switch; if the element is hidden, invisible switched.

//添加样式的方法
    $("#id").css('display','none');
    $("#id").css('display','block');
    或
    $("#id")[0].style.display = 'none'; 
    或
    $("#demo").attr("style","display:none;");//隐藏div
    $("#demo").attr("style","display:block;");//显示div
    或//添加class类名
    $("#select_contents").removeClass("hidden");
    $("#select_contents").addClass("hidden");