JavaScript-我想在我的按钮上添加一个延迟，这样每15秒只能点击一次

基本上正如标题所说，我想让我的按钮每15秒只能点击一次。一旦它被点击，我希望它不可用，再次点击15秒使用JavaScript。我真的不知道从哪里开始。这是我的代码，我有我的游戏，游戏工作完美，它只是我的按钮计时器是最后一块拼图

<script type="text/javascript">
    function randomImg1() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack1/messi.png";
      myImages1[2] = "Pack1/pele.png";
      myImages1[3] = "Pack1/keane.png";
      myImages1[4] = "Pack1/ronaldo.png";
      myImages1[5] = "Pack1/neymar.png";
      myImages1[6] = "Pack1/ramos.png";
      myImages1[7] = "Pack1/hazard.png";
      myImages1[8] = "Pack1/gerrard.png";
      myImages1[9] = "Pack1/oscar.png";
      myImages1[10] = "Pack1/aguero.png";
      myImages1[11] = "Pack1/essien.png";
      myImages1[12] = "Pack1/falcao.png";
      myImages1[13] = "Pack1/mata.png";
      myImages1[14] = "Pack1/depay.png";
      myImages1[15] = "Pack1/cuadrado.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
      return;
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button1').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg2() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack2/benteke.png";
      myImages1[2] = "Pack2/berg.png";
      myImages1[3] = "Pack2/cahill.png";
      myImages1[4] = "Pack2/cavani.png";
      myImages1[5] = "Pack2/costa.png";
      myImages1[6] = "Pack2/courtois.png";
      myImages1[7] = "Pack2/dawson.png";
      myImages1[8] = "Pack2/donovan.png";
      myImages1[9] = "Pack2/gomez.png";
      myImages1[10] = "Pack2/henry.png";
      myImages1[11] = "Pack2/lloris.png";
      myImages1[12] = "Pack2/navas.png";
      myImages1[13] = "Pack2/romao.png";
      myImages1[14] = "Pack2/taison.png";
      myImages1[15] = "Pack2/sneijder.png";
      myImages1[16] = "Pack2/alan1.png";
      myImages1[17] = "Pack2/barkley.png";
      myImages1[18] = "Pack2/begovic.png";
      myImages1[19] = "Pack2/cabella.png";
      myImages1[20] = "Pack2/capel.png";
      myImages1[21] = "Pack2/carlos.png";
      myImages1[22] = "Pack2/crespo.png";
      myImages1[23] = "Pack2/diaby.png";
      myImages1[24] = "Pack2/fowler.png";
      myImages1[25] = "Pack2/gullit.png";
      myImages1[26] = "Pack2/howedes.png";
      myImages1[27] = "Pack2/idk.png";
      myImages1[28] = "Pack2/kivrak.png";
      myImages1[29] = "Pack2/kucka.png";
      myImages1[30] = "Pack2/last.png";
      myImages1[31] = "Pack2/last2.png";
      myImages1[32] = "Pack2/lehmann.png";
      myImages1[33] = "Pack2/maldini.png";
      myImages1[34] = "Pack2/messi.png";
      myImages1[35] = "Pack2/messi inform.png";
      myImages1[36] = "Pack2/messi toty.png";
      myImages1[37] = "Pack2/rojo.png";
      myImages1[38] = "Pack2/ronaldo.png";
      myImages1[39] = "Pack2/sar.png";
      myImages1[40] = "Pack2/suker.png";
      myImages1[41] = "Pack2/ramos.png";

      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button2').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg3() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack3/akin.png";
      myImages1[2] = "Pack3/asamoah.png";
      myImages1[3] = "Pack3/astori.png";
      myImages1[4] = "Pack3/balotelling.png";
      myImages1[5] = "Pack3/boetius.png";
      myImages1[6] = "Pack3/bony.png";
      myImages1[7] = "Pack3/danny.png";
      myImages1[8] = "Pack3/dzeko.png";
      myImages1[9] = "Pack3/elia.png";
      myImages1[10] = "Pack3/evra.png";
      myImages1[11] = "Pack3/fabregas.png";
      myImages1[12] = "Pack3/fellaini.png";
      myImages1[13] = "Pack3/hulk.png";
      myImages1[14] = "Pack3/hunt.png";
      myImages1[15] = "Pack3/lennon.png";
      myImages1[16] = "Pack3/leonardo.png";
      myImages1[17] = "Pack3/lukaku.png";
      myImages1[18] = "Pack3/marchisio.png";
      myImages1[19] = "Pack3/mavuba.png";
      myImages1[20] = "Pack3/mertesacker.png";
      myImages1[21] = "Pack3/muntari.png";
      myImages1[22] = "Pack3/nani.png";
      myImages1[23] = "Pack3/reus.png";
      myImages1[24] = "Pack3/ribery.png";
      myImages1[25] = "Pack3/rodrigo.png";
      myImages1[26] = "Pack3/sanchez.png";
      myImages1[27] = "Pack3/schurrle.png";
      myImages1[28] = "Pack3/sterling.png";
      myImages1[29] = "Pack3/turan.png";
      myImages1[30] = "Pack3/uche.png";
      myImages1[31] = "Pack3/valencia.png";
      myImages1[32] = "Pack3/vermaelen.png";
      myImages1[33] = "Pack3/vitolo.png";
      myImages1[34] = "Pack3/walker.png";
      myImages1[35] = "Pack3/witsel.png";
      myImages1[36] = "Pack3/xavi.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button3').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg4() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack4/aguero.png";
      myImages1[2] = "Pack4/alba.png";
      myImages1[3] = "Pack4/atsu.png";
      myImages1[4] = "Pack4/bacca.png";
      myImages1[5] = "Pack4/benarfa.png";
      myImages1[6] = "Pack4/benzema.png";
      myImages1[7] = "Pack4/blind.png";
      myImages1[8] = "Pack4/buffon.png";
      myImages1[9] = "Pack4/bystrov.png";
      myImages1[10] = "Pack4/casilla.png";
      myImages1[11] = "Pack4/clichy.png";
      myImages1[12] = "Pack4/dembele.png";
      myImages1[13] = "Pack4/farfan.png";
      myImages1[14] = "Pack4/hazard.png";
      myImages1[15] = "Pack4/howard.png";
      myImages1[16] = "Pack4/ibarbo.png";
      myImages1[17] = "Pack4/inler.png";
      myImages1[18] = "Pack4/jovetic.png";
      myImages1[19] = "Pack4/keane.png";
      myImages1[20] = "Pack4/keita.png";
      myImages1[21] = "Pack4/lewandowski.png";
      myImages1[22] = "Pack4/luis.png";
      myImages1[23] = "Pack4/luisao.png";
      myImages1[24] = "Pack4/luiz.png";
      myImages1[25] = "Pack4/matic.png";
      myImages1[26] = "Pack4/matip.png";
      myImages1[27] = "Pack4/mollo.png";
      myImages1[28] = "Pack4/oscar.png";
      myImages1[29] = "Pack4/perrin.png";
      myImages1[30] = "Pack4/piszczek.png";
      myImages1[31] = "Pack4/piti.png";
      myImages1[32] = "Pack4/rafa.png";
      myImages1[33] = "Pack4/reina.png";
      myImages1[34] = "Pack4/robbie.png";
      myImages1[35] = "Pack4/rodriguez.png";
      myImages1[36] = "Pack4/ronaldi.png";
      myImages1[37] = "Pack4/sakho.png";
      myImages1[38] = "Pack4/tarasov.png";
      myImages1[39] = "Pack4/tiote.png";
      myImages1[40] = "Pack4/vidic.png";
      myImages1[41] = "Pack4/walcott.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button4').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg5() {
    var myImages1 = new Array ();
      myImages1[1] = "Pack5/alonso.png";
      myImages1[2] = "Pack5/beto.png";
      myImages1[3] = "Pack5/busq.png";
      myImages1[4] = "Pack5/campbell.png";
      myImages1[5] = "Pack5/carrillo.png";
      myImages1[6] = "Pack5/cassano.png";
      myImages1[7] = "Pack5/cerci.png";
      myImages1[8] = "Pack5/cesar.png";
      myImages1[9] = "Pack5/coleman.png";
      myImages1[10] = "Pack5/defoe.png";
      myImages1[11] = "Pack5/dempsey.png";
      myImages1[12] = "Pack5/diarra.png";
      myImages1[13] = "Pack5/dijk.png";
      myImages1[14] = "Pack5/diouf.png";
      myImages1[15] = "Pack5/dost.png";
      myImages1[16] = "Pack5/doumbia.png";
      myImages1[17] = "Pack5/felipe.png";
      myImages1[18] = "Pack5/fer.png";
      myImages1[19] = "Pack5/garay.png";
      myImages1[20] = "Pack5/gourcuff.png";
      myImages1[21] = "Pack5/guzman.png";
      myImages1[22] = "Pack5/higuain.png";
      myImages1[23] = "Pack5/hummels.png";
      myImages1[24] = "Pack5/iborra.png";
      myImages1[25] = "Pack5/isco.png";
      myImages1[26] = "Pack5/ivanovic.png";
      myImages1[27] = "Pack5/kroos.png";
      myImages1[28] = "Pack5/martinez.png";
      myImages1[29] = "Pack5/navas.png";
      myImages1[30] = "Pack5/pirlo.png";
      myImages1[31] = "Pack5/rakitic.png";
      myImages1[32] = "Pack5/ruffier.png";
      myImages1[33] = "Pack5/santon.png";
      myImages1[34] = "Pack5/schar.png";
      myImages1[35] = "Pack5/szalai.png";
      myImages1[36] = "Pack5/tosic.png";
      myImages1[37] = "Pack5/valdes.png";
      myImages1[38] = "Pack5/varane.png";
      myImages1[39] = "Pack5/villa.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button5').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg6() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack6/aogo.png";
      myImages1[2] = "Pack6/arbeloa.png";
      myImages1[3] = "Pack6/aurier.png";
      myImages1[4] = "Pack6/baines.png";
      myImages1[5] = "Pack6/bender.png";
      myImages1[6] = "Pack6/caceres.png";
      myImages1[7] = "Pack6/cole.png";
      myImages1[8] = "Pack6/crouch.png";
      myImages1[9] = "Pack6/cuadrado.png";
      myImages1[10] = "Pack6/demba.png";
      myImages1[11] = "Pack6/depay.png";
      myImages1[12] = "Pack6/enrique.png";
      myImages1[13] = "Pack6/gerrard.png";
      myImages1[14] = "Pack6/hamsik.png";
      myImages1[15] = "Pack6/honda.png";
      myImages1[16] = "Pack6/huth.png";
      myImages1[17] = "Pack6/inan.png";
      myImages1[18] = "Pack6/jarvis.png";
      myImages1[19] = "Pack6/lahm.png";
      myImages1[20] = "Pack6/lamela.png";
      myImages1[21] = "Pack6/leno.png";
      myImages1[22] = "Pack6/lucas.png";
      myImages1[23] = "Pack6/maicon.png";
      myImages1[24] = "Pack6/mata.png";
      myImages1[25] = "Pack6/matuidi.png";
      myImages1[26] = "Pack6/mikel.png";
      myImages1[27] = "Pack6/motta.png";
      myImages1[28] = "Pack6/nasri.png";
      myImages1[29] = "Pack6/neuer.png";
      myImages1[30] = "Pack6/neymar.png";
      myImages1[31] = "Pack6/pabon.png";
      myImages1[32] = "Pack6/pele.png";
      myImages1[33] = "Pack6/pogba.png";
      myImages1[34] = "Pack6/prodl.png";
      myImages1[35] = "Pack6/ramos.png";
      myImages1[36] = "Pack6/robben.png";
      myImages1[37] = "Pack6/rondon.png";
      myImages1[38] = "Pack6/ruiter.png";
      myImages1[39] = "Pack6/sane.png";
      myImages1[40] = "Pack6/sergio.png";
      myImages1[41] = "Pack6/silva.png";
      myImages1[42] = "Pack6/subotic.png";
      myImages1[43] = "Pack6/torres.png";
      myImages1[44] = "Pack6/zarate.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button6').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg7() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack7/agger.png";
      myImages1[2] = "Pack7/benatia.png";
      myImages1[3] = "Pack7/boateng.png";
      myImages1[4] = "Pack7/bruma.png";
      myImages1[5] = "Pack7/callejon.png";
      myImages1[6] = "Pack7/correa.png";
      myImages1[7] = "Pack7/costa.png";
      myImages1[8] = "Pack7/degea.png";
      myImages1[9] = "Pack7/eliseu.png";
      myImages1[10] = "Pack7/eriksen.png";
      myImages1[11] = "Pack7/gakpe.png";
      myImages1[12] = "Pack7/godin.png";
      myImages1[13] = "Pack7/guarin.png";
      myImages1[14] = "Pack7/hernanes.png";
      myImages1[15] = "Pack7/herrmann.png";
      myImages1[16] = "Pack7/jardel.png";
      myImages1[17] = "Pack7/jefferson.png";
      myImages1[18] = "Pack7/juanfran.png";
      myImages1[19] = "Pack7/konko.png";
      myImages1[20] = "Pack7/lallana.png";
      myImages1[21] = "Pack7/mangala.png";
      myImages1[22] = "Pack7/marlos.png";
      myImages1[23] = "Pack7/medel.png";
      myImages1[24] = "Pack7/modric.png";
      myImages1[25] = "Pack7/montoya.png";
      myImages1[26] = "Pack7/musa.png";
      myImages1[27] = "Pack7/ochoa.png";
      myImages1[28] = "Pack7/ozil.png";
      myImages1[29] = "Pack7/pique.png";
      myImages1[30] = "Pack7/remy.png";
      myImages1[31] = "Pack7/rooney.png";
      myImages1[32] = "Pack7/smalling.png";
      myImages1[33] = "Pack7/sterling.png";
      myImages1[34] = "Pack7/trasch.png";
      myImages1[35] = "Pack7/ukra.png";
      myImages1[36] = "Pack7/wakaso.png";
      myImages1[37] = "Pack7/zengin.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }

document.getElementById('button7').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
<script>
    function randomImg8() {
      var myImages1 = new Array ();
      myImages1[1] = "Pack8/carroll.png";
      myImages1[2] = "Pack8/essien.png";
      myImages1[3] = "Pack8/falcao.png";
      myImages1[4] = "Pack8/fazio.png";
      myImages1[5] = "Pack8/ferdinand.png";
      myImages1[6] = "Pack8/figo.png";
      myImages1[7] = "Pack8/castan.png";
      myImages1[8] = "Pack8/koke.png";
      myImages1[9] = "Pack8/naldo.png";
      myImages1[10] = "Pack8/kweuke.png";
      myImages1[11] = "Pack8/olsson.png";
      myImages1[12] = "Pack8/eto.png";
      myImages1[13] = "Pack8/ramsey.png";
      myImages1[14] = "Pack8/gustavo.png";
      myImages1[15] = "Pack8/arteta.png";
      myImages1[16] = "Pack8/fernando.png";
      myImages1[17] = "Pack8/xandao.png";
      myImages1[18] = "Pack8/mandanda.png";
      myImages1[19] = "Pack8/rafinha.png";
      myImages1[20] = "Pack8/ciani.png";
      myImages1[21] = "Pack8/parejo.png";
      myImages1[22] = "Pack8/young.png";
      myImages1[23] = "Pack8/tadic.png";
      myImages1[24] = "Pack8/vargas.png";
      myImages1[25] = "Pack8/rossi.png";
      myImages1[26] = "Pack8/moralez.png";
      myImages1[27] = "Pack8/distin.png";
      myImages1[28] = "Pack8/melo.png";
      myImages1[29] = "Pack8/hart.png";
      myImages1[30] = "Pack8/ibra.png";
      myImages1[31] = "Pack8/immobile.png";
      myImages1[32] = "Pack8/khedira.png";
      myImages1[33] = "Pack8/lampard.png";
      myImages1[34] = "Pack8/lavezzi.png";
      myImages1[35] = "Pack8/okocha.png";
      myImages1[36] = "Pack8/shaqiri.png";
      myImages1[37] = "Pack8/tevez.png";
      myImages1[38] = "Pack8/vanbasten.png";
      myImages1[39] = "Pack8/vanpersie.png";
      var rnd = Math.floor( Math.random() * myImages1.length );
if (rnd == 0) {
        rnd = 1;
    }
document.getElementById('button8').innerHTML = '<img class="who" src="' + myImages1[rnd] + '"/>'
    }
</script>
    </head>





<body>
<div id="wrapper">
<img class="jim3" src="google+.png" alt="google" width="50" height="50"/>
<a href="https://twitter.com/The_Jimnah"><img class="jim" src="twitter.png" alt="jimbo" width="50" height="50"/></a>
<a href="https://www.youtube.com/channel/UCkVOQ3vO0VXX9lS6khUZ-cg"><img class="jim2" src="youtube.png" alt="jimbo" width="50" height="50"/></a>
<img class="refresh" src="refresh.png" alt="play"/>
<div id="button1">
<input class="randombutton"  id="aaa" style="float:left;" type="button" value="OPEN PACK"  onclick= "
 randomImg1(); 
 randomImg2(); 
 randomImg3(); 
 randomImg4(); 
 randomImg5(); 
 randomImg6(); 
 randomImg7(); 
 randomImg8();"/>
</div>
<div id="button2">
 </div>
 <div id="button3">
 </div>
 <div id="button4">
 </div>
 <div id="button5">
 </div>
  <div id="button6">
 </div>
  <div id="button7">
 </div>
   <div id="button8">
 </div>
 </div>
 </body>

函数randomImg1（）{
var myImages1=新数组（）；
myImages1[1]=“Pack1/mesi.png”；
myImages1[2]=“Pack1/pele.png”；
myImages1[3]=“Pack1/keane.png”；
myImages1[4]=“Pack1/ronaldo.png”；
myImages1[5]=“Pack1/neymar.png”；
myImages1[6]=“Pack1/ramos.png”；
myImages1[7]=“Pack1/hazard.png”；
myImages1[8]=“Pack1/gerrard.png”；
myImages1[9]=“Pack1/oscar.png”；
myImages1[10]=“Pack1/aguero.png”；
myImages1[11]=“Pack1/essian.png”；
myImages1[12]=“Pack1/falcao.png”；
myImages1[13]=“Pack1/mata.png”；
myImages1[14]=“Pack1/depay.png”；
myImages1[15]=“Pack1/cuadrado.png”；
var rnd=Math.floor（Math.random（）*myImages1.length）；
返回；
如果（rnd==0）{
rnd=1；
}
document.getElementById（'button1'）。innerHTML=''
}
函数randomImg2（）{
var myImages1=新数组（）；
myImages1[1]=“Pack2/benteke.png”；
myImages1[2]=“Pack2/berg.png”；
myImages1[3]=“Pack2/cahill.png”；
myImages1[4]=“Pack2/cavani.png”；
myImages1[5]=“Pack2/costa.png”；
myImages1[6]=“Pack2/courtois.png”；
myImages1[7]=“Pack2/dawson.png”；
myImages1[8]=“Pack2/donovan.png”；
myImages1[9]=“Pack2/gomez.png”；
myImages1[10]=“Pack2/henry.png”；
myImages1[11]=“Pack2/lloris.png”；
myImages1[12]=“Pack2/navas.png”；
myImages1[13]=“Pack2/romao.png”；
myImages1[14]=“Pack2/taison.png”；
myImages1[15]=“Pack2/sneider.png”；
myImages1[16]=“Pack2/alan1.png”；
myImages1[17]=“Pack2/barkley.png”；
myImages1[18]=“Pack2/begovic.png”；
myImages1[19]=“Pack2/cabella.png”；
myImages1[20]=“Pack2/capel.png”；
myImages1[21]=“Pack2/carlos.png”；
myImages1[22]=“Pack2/crespo.png”；
myImages1[23]=“Pack2/diaby.png”；
myImages1[24]=“Pack2/fowler.png”；
myImages1[25]=“Pack2/gullit.png”；
myImages1[26]=“Pack2/howedes.png”；
myImages1[27]=“Pack2/idk.png”；
myImages1[28]=“Pack2/kivrak.png”；
myImages1[29]=“Pack2/kucka.png”；
myImages1[30]=“Pack2/last.png”；
myImages1[31]=“Pack2/last2.png”；
myImages1[32]=“Pack2/lehmann.png”；
myImages1[33]=“Pack2/maldini.png”；
myImages1[34]=“Pack2/mesi.png”；
myImages1[35]=“Pack2/mesi info.png”；
myImages1[36]=“Pack2/mesi toty.png”；
myImages1[37]=“Pack2/rojo.png”；
myImages1[38]=“Pack2/ronaldo.png”；
myImages1[39]=“Pack2/sar.png”；
myImages1[40]=“Pack2/suker.png”；
myImages1[41]=“Pack2/ramos.png”；
var rnd=Math.floor（Math.random（）*myImages1.length）；
如果（rnd==0）{
rnd=1；
}
document.getElementById（'button2'）。innerHTML=''
}
函数randomImg3（）{
var myImages1=新数组（）；
myImages1[1]=“Pack3/akin.png”；
myImages1[2]=“Pack3/asamoah.png”；
myImages1[3]=“Pack3/astori.png”；
myImages1[4]=“Pack3/balotelling.png”；
myImages1[5]=“Pack3/boetius.png”；
myImages1[6]=“Pack3/bony.png”；
myImages1[7]=“Pack3/danny.png”；
myImages1[8]=“Pack3/dzeko.png”；
myImages1[9]=“Pack3/elia.png”；
myImages1[10]=“Pack3/evra.png”；
myImages1[11]=“Pack3/fabregas.png”；
myImages1[12]=“Pack3/fellaini.png”；
myImages1[13]=“Pack3/hulk.png”；
myImages1[14]=“Pack3/hunt.png”；
myImages1[15]=“Pack3/lennon.png”；
myImages1[16]=“Pack3/leonardo.png”；
myImages1[17]=“Pack3/lukaku.png”；
myImages1[18]=“Pack3/marchisio.png”；
myImages1[19]=“Pack3/mavuba.png”；
myImages1[20]=“Pack3/mertesacker.png”；
myImages1[21]=“Pack3/muntari.png”；
myImages1[22]=“Pack3/nani.png”；
myImages1[23]=“Pack3/reus.png”；
myImages1[24]=“Pack3/ribery.png”；
myImages1[25]=“Pack3/rodrigo.png”；
myImages1[26]=“Pack3/sanchez.png”；
myImages1[27]=“Pack3/schurrle.png”；
myImages1[28]=“Pack3/sterling.png”；
myImages1[29]=“Pack3/turan.png”；
myImages1[30]=“Pack3/uche.png”；
myImages1[31]=“Pack3/valencia.png”；
myImages1[32]=“Pack3/vermaelen.png”；
myImages1[33]=“Pack3/vitolo.png”；
myImages1[34]=“Pack3/walker.png”；
myImages1[35]=“Pack3/witsel.png”；
myImages1[36]=“Pack3/xavi.png”；
var rnd=Math.floor（Math.random（）*myImages1.length）；
如果（rnd==0）{
rnd=1；
}
document.getElementById（'button3'）。innerHTML=''
}
函数randomImg4（）{
var myImages1=新数组（）；
myImages1[1]=“Pack4/aguero.png”；
myImages1[2]=“Pack4/alba.png”；
myImages1[3]=“Pack4/atsu.png”；
myImages1[4]=“Pack4/bacca.png”；
myImages1[5]=“Pack4/benarfa.png”；
myImages1[6]=“Pack4/benzema.png”；
myImages1[7]=“Pack4/blind.png”；
myImages1[8]=“Pack4/buffon.png”；
myImages1[9]=“Pack4/bystrov.png”；
myImages1[10]=“Pack4/casilla.png”；
myImages1[11]=“Pack4/clichy.png”；
myImages1[12]=“Pack4/dembele.png”；
myImages1[13]=“Pack4/farfan.png”；
myImages1[14]=“Pack4/hazard.png”；
myImages1[15]=“Pack4/howard.png”；
myImages1[16]=“Pack4/ibarbo.png”；
myImages1[17]=“Pack4/inler.png”；
myImages1[18]=“Pack4/jovetic.png”；
myImages1[19]=“Pack4/keane.png”；
myImages1[20]=“Pack4/keita.png”；
myImages1[21]=“Pack4/lewandowski.png”；
myImages1[22]=“Pack4/luis.png”；
myImages1[23]=“Pac
var buttonHasBeenClicked = false;

function btn_click() {
    if (!buttonHasBeenClicked) {
        buttonHasBeenClicked = true;
        setTimeout(function() {buttonHasBeenClicked = false;}, 15000);
        //do your stuff here
    }
}