<!--游戲開(kāi)始的界面-->
 <div id="gameStart">
  <div id="start">開(kāi)始</div>
  <div id="describe">說(shuō)明</div>
  <div id="des">打字游戲介紹：點(diǎn)擊開(kāi)始,進(jìn)入游戲開(kāi)始界面,
  通過(guò)點(diǎn)擊下落的字母可以獲得得分和正確率
  <span id="cl1">關(guān)閉</span>
  </div>
</div>

operate.onclick = function (evt) {
  var e = evt || window.event;
  var target = e.srcElement || e.target;
  // target:當(dāng)前事件的目標(biāo)dom節(jié)點(diǎn)
  // if(target.className == "t"){
  //  gameStart.style.display = "block";
  //  game.style.display = "none";
  // }
  if(target.className =="set"){
   sel.style.display = "block";
  }
  // 進(jìn)入游戲界面之后的開(kāi)始游戲
  // 目標(biāo)元素的className?。剑健?
  if(target.className =="s"){
   target.innerHTML = target.innerHTML == "開(kāi)始"?"暫停":"開(kāi)始";
   if(target.innerHTML == "開(kāi)始"){
    operate.lastElementChild.style.cursor = "pointer";
    clearInterval(c);
    c = undefined;
    clearAllLetters();
   }else{
    //游戲的開(kāi)始
    operate.lastElementChild.style.cursor = "not-allowed";
    //控制單位時(shí)間內(nèi)字母的多少的定時(shí)器
   c = setInterval(function () {
    createLetter();
    letterEles = document.getElementsByClassName("active");
   },level*1000);//控制顯示頁(yè)面字母的多少
    //暫停之后的開(kāi)始游戲
    gameStar();
   }
  }
 // 處理結(jié)束游戲
  if(target.className == "f"){
   finished();
  }
 // 處理退出游戲
  if(target.className == "t"){
 
  // 首先處理結(jié)束游戲要做的事情
   finished();
  // 顯示游戲開(kāi)始界面，隱藏進(jìn)入游戲界面
   game.style.display = "none";
   gameStart.style.display = "block";
  }
 }

<ul id="cn">
 <li>qwe</li>
 <li>q2w</li>
 <li>wee</li>
 <li>eer</li>
 <li>ewe</li>
</ul>

window.onload() = function () {
 var ul = document.getElementById("cn");
 var li = ul.getElementsByTagName('li');
 for(int i = 0;i < li.length;i++){
 alert(1212);
 }
}

window.onload() = function () {
 var ul = document.getElementById("cn");
 ul.onclick = function () { 
 alert('1220');
 }
}

window.onload() = function () {
 var ul = document.getElementById("cn");
 ul.onclick = function (evt) {
 var e = evt || window.event;
 var target = e.target || e.srcElement;
 if(target.nodeName == 'li'){
 alert('1220');
 }
 }
}

//evt代表的是事件對(duì)象
 document.onkeyup = function (evt) {
  var e = evt || window.event;
  var codeVal = e.keyCode;
  // e.keyCode獲得鍵盤(pán)碼
  if(codeVal >= 65 && codeVal <= 90){
   count++;
  }
  // 根據(jù)Unicode編碼找到對(duì)應(yīng)字符
  var char = keyVal[codeVal];
  if(char){
   var index = letters.search(eval("/" + char + "/gi"));
   // var index = letters.search(char);
   if(index != -1) {
   game.removeChild(letterEles[index]);
   var exp = eval("/" + char + "/gi");
   letters = letters.replace(exp, "");
   // letters = letters.replace(char,"");
   tit.children[0].firstElementChild.innerHTML = ++score;
   tit.children[1].firstElementChild.innerHTML = (score/count*100).toFixed(2) + "%";
  }
  }
 }