value/innerHTML/innerText
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS</title>
</head>
<body>
<div id="box">
<button class="btn">按钮</button>
<span id="span">
<a href="#">百度一下</a>
</span>
<p>我是段落</p>
</div>
<script type="text/javascript">
window.onload = function() {
var input = document.getElementById("inp");
input.value = "嘻嘻"; //向input写入内容
var box = document.getElementById("box");
console.log(box.innerHTML); //输出div的所有标签
console.log(box.innerText); //输出div的双标签的内容
}
}
</script>
</body>
</html>