jquery设立div位置

var p = $("p:first");
var position = p.position();
$("p:last").text( "left: " + position.left + ", top: " + position.top );

$("p:last").css("position","absolute");
$("p:last").css("left",position.left + 5 + "px");
$("p:last").css("top",position.top + 20 + "px");