<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 字符串</h1>
<p>打破字符串中代码行的最安全方法是使用字符串添加。</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = "Hello " +
"Dolly!";
</script>
</body>
</html>