http://api.jquery.com/animate/一个>

animate 有一个完整"的功能.您应该将第二个动画放在第一个的完整功能中.

animate has a "complete" function. You should place the 2nd animation in the complete function of the first.

示例 http://jsfiddle.net/xgJns/

$("#div1").animate({opacity:.1},1000,function(){
    $("#div2").animate({opacity:.1},1000);    
});​