html运行实例（eg_js_number_add_strings

代码示例：（标识：eg_js_number_add_strings_1）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 数字</h1>

<p>如果添加两个数字字符串，结果将是级联字符串：</p>

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

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

</body>
</html>