html运行实例（eg_js_number_add_strings

代码示例：（标识：eg_js_number_add_strings_5）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 数字</h1>

<p>一个常见的错误是期望这个结果是 102030：</p>

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

<script>
var x = 10;
var y = 20;
var z = "30";
var result = x + y + z;
document.getElementById("demo").innerHTML = result;
</script>

</body>
</html>