实例 »

<p> + 号运算符用于连接字符串。</p>

<button onclick="myFunction()">点我</button>

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

<script>

  function myFunction() {

    var text1 = "Good ";

    var text2 = "Morning";

    text1 += text2

    document.getElementById("demo").innerHTML = text1;

  }

</script>