opacity:0;filter:alpha(opacity=0);
var flag = 1;//计数器$('div').click(function () {if (flag == 1) {//第一次点击$(this).css('background', 'black');flag = 2;} else if (flag == 2) {//第二次点击$(this).css('background', 'blue');flag = 3} else if (flag
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