​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>把函数存储在变量中后，该变量可用作函数：</p>
​
<p id="demo"></p>
​
<script>
var x = function (a, b) {return a * b};
document.getElementById("demo").innerHTML = x(4, 3);
</script>
​
</body>
</html>
​