Question

急急急。。用js或者jquery实现数字一天减五个，1号300，2号295，3号290。以此类推，直到30号

<div class="bannerdiv">
<img src="images/pic33.gif">
<div class="banner-shuzi">
<div class="bn-sz">还 剩</div>
<div><span class="num">300</span>组</div>
</div>
</div>

Answer 1

var dq_time = 0;
var zongshu = 300;
var bushu = 5;
var day_miao = 24*60*60*1000;
function gtime(){
dq_time = new Date().getDate();
if(dq_time>30){
alert("31号结束");
clearInterval(a_time);
}
zongshu = zongshu - dq_time*bushu;
$(".bn-sz").html(zongshu);
}
gtime()
var a_time = setInterval(gtime,day_miao);

Answer 2

var j = 300;
for(var i = 1;i <=30 ;i++){
console.log("第"+i+"日 还剩"+j+"组");
j=j-5;
}