当我添加addEventListene时会导致以下错误：
addEventListener错误：未捕获TypeError：无法在ttt.html读取null的属性'addEventListener'：24
我不知道为什么它会检测到空。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="Gaming" content="">
<meta name="SkarmArri" content="">
<title>Gameming</title>
<link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="css/portfolio-item.css" rel="stylesheet">
<link href="css/personal_page_style.css" rel="stylesheet">
<script type="text/javascript">
var game = ["N" , "N", "N",
"N", "N", "N",
"N", "N", "N"];
var gamen = [0, 0, 0,
0, 0, 0,
0, 0, 0];
var cs = 0;
var score1 = 0;
var score2 = 0;
var diascawf = document.getElementById("b1")
diascawf.addEventListener("click", doSet)
function doSet(){
alert("Hello World")
}
</script>
</head>
<body>
<!-- Menu -->
<nav class="navbar navbar-expand-lg navbar-dark bg-danger fixed-top">
<div class="container">
<a href="index.html"><img src="assets/logo.png" alt="Logo" width="180px;" height="50px;"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="index.html">Home
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item active">
<a class="nav-link" href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contacts.html">Contact</a>
</li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="cont-div-white1">
<table id="tb-ttt">
<tr>
<td class="td-ttt" id="b1" onclick="doPutLetter('1')"></td>
<td class="td-ttt" id="b2" onclick="doPutLetter('2')">a</td>
<td class="td3-ttt" id="b3" onclick="doPutLetter('3')">a</td>
</tr>
<tr>
<td class="td-ttt" id="b4" onclick="doPutLetter('4')">a</td>
<td class="td-ttt" id="b5" onclick="doPutLetter('5')">a</td>
<td class="td3-ttt" id="b6" onclick="doPutLetter('6')">a</td>
</tr>
<tr>
<td class="td2-ttt" id="b7" onclick="doPutLetter('7')">a</td>
<td class="td2-ttt" id="b8" onclick="doPutLetter('8')">a</td>
<td class="td4-ttt" id="b9" onclick="doPutLetter('9')">a</td>
</tr>
</table>
</div>
</div>
<!-- /.container -->
<!-- Footer -->
<footer class="py-5 bg-dark">
<div class="container">
<p class="m-0 text-center text-white">Copyright © Gameming 2018</p>
</div>
<!-- /.container -->
</footer>
<!-- Bootstrap core JavaScript -->
<script src="vendor/jquery/jquery.min.js"></script>
<script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
</body>
</html>
答案 0 :(得分：0)
添加一个侦听器以检查dom何时加载
window.addEventListener("load" , function() {});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="Gaming" content="">
<meta name="SkarmArri" content="">
<title>Gameming</title>
<link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="css/portfolio-item.css" rel="stylesheet">
<link href="css/personal_page_style.css" rel="stylesheet">
<script type="text/javascript">
window.addEventListener("load", _loaded);
function _loaded() {
var game = ["N" , "N", "N",
"N", "N", "N",
"N", "N", "N"];
var gamen = [0, 0, 0,
0, 0, 0,
0, 0, 0];
var cs = 0;
var score1 = 0;
var score2 = 0;
var diascawf = document.getElementById("b1")
diascawf.addEventListener("click", doSet)
function doSet(){
alert("Hello World")
}
}
</script>
</head>
<body>
<!-- Menu -->
<nav class="navbar navbar-expand-lg navbar-dark bg-danger fixed-top">
<div class="container">
<a href="index.html"><img src="assets/logo.png" alt="Logo" width="180px;" height="50px;"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="index.html">Home
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item active">
<a class="nav-link" href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contacts.html">Contact</a>
</li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="cont-div-white1">
<table id="tb-ttt">
<tr>
<td class="td-ttt" id="b1" onclick="doPutLetter('1')"></td>
<td class="td-ttt" id="b2" onclick="doPutLetter('2')">a</td>
<td class="td3-ttt" id="b3" onclick="doPutLetter('3')">a</td>
</tr>
<tr>
<td class="td-ttt" id="b4" onclick="doPutLetter('4')">a</td>
<td class="td-ttt" id="b5" onclick="doPutLetter('5')">a</td>
<td class="td3-ttt" id="b6" onclick="doPutLetter('6')">a</td>
</tr>
<tr>
<td class="td2-ttt" id="b7" onclick="doPutLetter('7')">a</td>
<td class="td2-ttt" id="b8" onclick="doPutLetter('8')">a</td>
<td class="td4-ttt" id="b9" onclick="doPutLetter('9')">a</td>
</tr>
</table>
</div>
</div>
<!-- /.container -->
<!-- Footer -->
<footer class="py-5 bg-dark">
<div class="container">
<p class="m-0 text-center text-white">Copyright © Gameming 2018</p>
</div>
<!-- /.container -->
</footer>
<!-- Bootstrap core JavaScript -->
<script src="vendor/jquery/jquery.min.js"></script>
<script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
</body>
</html>