<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 字符串方法</h1>
<p>concat() 方法连接两个或多个字符串：</p>
<p id="demo"></p>
<script>
var text1 = "Hello";
var text2 = "World!";
var text3 = text1.concat(" ",text2);
document.getElementById("demo").innerHTML = text3;
</script>
</body>
</html>