document.getElementById("button2").addEventListener("click", function(){
document.getElementById("box").backgroundColor="blue";
});<!DOCTYPE html>
<html>
<head>
<title>Jiggle Into JavaScript</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript" src="javascript.js"></script>
</head>
<body>
<p>Press the buttons to change the box!</p>
<div id="box" style="height:150px; width:150px; background-color:orange; margin:25px"></div>
<button id="button1">Grow</button>
<button id="button2">Blue</button>
<button id="button3">Fade</button>
<button id="button4">Reset</button>
</body>
</html>当我单击按钮2时，它应该将框从橙色变为蓝色。我的 javascript 链接是否错误？
最佳答案
要访问 backgroundColor，您需要访问元素的 style 属性，因为它嵌套在元素下面。
所以你需要做 document.getElementById("box").style.backgroundColor="blue";
请参阅下面的代码:
document.getElementById("button2").addEventListener("click", function(){
document.getElementById("box").style.backgroundColor="blue";
});<!DOCTYPE html>
<html>
<head>
<title>Jiggle Into JavaScript</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript" src="javascript.js"></script>
</head>
<body>
<p>Press the buttons to change the box!</p>
<div id="box" style="height:150px; width:150px; background-color:orange; margin:25px"></div>
<button id="button1">Grow</button>
<button id="button2">Blue</button>
<button id="button3">Fade</button>
<button id="button4">Reset</button>
</body>
</html>关于javascript - 我的 Javascript 没有执行将框的背景颜色更改为蓝色。我的代码有什么问题吗？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49099269/