代码示例:(标识:jsck_oper_string_2)
<!DOCTYPE html>
<html>
<body>

<p>+ 运算符连接(添加)字符串。</p>

<button onclick="myFunction()">试一试</button>

<p id="demo"></p>

<script>
function myFunction() {
  var text1 = "Good ";
  var text2 = "Morning";
  text1 += text2
  document.getElementById("demo").innerHTML = text1;
}
</script>

</body>
</html>
运行结果: