html运行实例（eg_js_operator_concatenate

代码示例：（标识：eg_js_operator_concatenate_3）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 运算符</h1>

<p>对数字和字符串相加，会返回字符串。</p>

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

<script>
var x = 7 + 8;
var y = "7" + 8;
var z = "Hello" + 7;
document.getElementById("demo").innerHTML =
x + "<br>" + y + "<br>" + z;
</script>

</body>
</html>