​x
 
<!DOCTYPE html>
<html>
<body>
​
<h3>如何访问 BR 元素的演示</h3>
​
<div>This is a div <br id="myBR"> element with some <br> line breaks.</div>
​
<p>单击按钮将文档中的第一个 BR 元素设置为 display="none"。</p>
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<button onclick="myFunction()">试一试</button>
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<script>
function myFunction() {
  var x = document.getElementById("myBR");
  x.style.display = "none";
}
</script>
​
</body>
</html>
​