很漂亮的一个带进度条显示的全选反选特效，还可以自定义同时选中个数，结合自己的网站需求来修改即可。
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<a href="https://www.wuming.ren">武鸣人</a>，各种信息资源免费发布，分享励志语录经典短句，减肥健身常识，各种js特效代码。网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)<hr>
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<INPUT id=checkall onclick=check_all() type=checkbox><LABEL for=checkall>全部选择</LABEL> 线程数：<INPUT id=the_thread style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; FONT-SIZE: 12px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; HEIGHT: 15px" maxLength=2 size=2 value=10> <BR>
<TABLE border=0>
<TBODY>
<TR>
<TD style="WIDTH: 100px; over-flow: hidden"><SPAN id=show></SPAN></TD>
<TD style="WIDTH: 400px">
<TABLE id=bar
style="BORDER-RIGHT: black 1px solid; BORDER-TOP: black 1px solid; DISPLAY: none; BORDER-LEFT: black 1px solid; WIDTH: 90%; BORDER-BOTTOM: black 1px solid; HEIGHT: 10px">
<TBODY>
<TR>
<TD id=bar1 style="WIDTH: 0%" bgColor=skyblue></TD>
<TD id=bar2 style="WIDTH: 100%"></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD colSpan=2><SPAN id=result></SPAN></TD></TR></TBODY></TABLE>
<SCRIPT language=JavaScript>
var total = 505;
var thread_num;
var pre_thread;
var thread = new Array();
var completed = 0;
var start_time = null;
for(i=0;i<total;i++)document.write("<input type=checkbox id=cbox>");
function init_para(){
thread_num = parseInt(the_thread.value);
if(isNaN(thread_num)) thread_num = 10;
pre_thread = Math.floor(total/thread_num);
result.innerText = "";
bar1.style.width = "0%";
bar2.style.width = "100%";
bar.style.display = "";
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function check_all(){
checkall.disabled = true;
init_para();
for(var i=0;i<thread_num;i++){
thread[i]=[setInterval("thread["+i+"][1]<pre_thread?check_unit("+i+"*pre_thread + thread["+i+"][1]++):clearInterval(thread["+i+"][0])",1),0];
}
thread[i]=[setInterval("thread["+i+"][1]<total%thread_num?check_unit("+i+"*pre_thread + thread["+i+"][1]++):clearInterval(thread["+i+"][0])",1),0];
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function check_unit(num){
if(completed==0)start_time=new Date;
cbox[num].checked=checkall.checked;
completed++;
var cur_rate = Math.round(completed*100/total);
show.innerText = completed + "/" + total + " : " + cur_rate + "%";
bar1.style.width = cur_rate + "%";
bar2.style.width = (100-cur_rate) + "%";
if(completed == total){
completed = 0
checkall.disabled = false;
result.innerText = "("+total+"单元/"+thread_num+"线程，总共耗时："+((new Date)-start_time)+" ms)";
}
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
</SCRIPT>
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