​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 全局作用域</h1>
​
<p>可以从任何脚本或函数中访问全局变量。</p>
​
<p id="demo"></p>
​
<script>
var carName = "porsche";
myFunction();
​
function myFunction() {
    document.getElementById("demo").innerHTML =
    "I can display " + carName;
}
</script>
​
</body>
</html>
​