​x
 
<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 函数</h1>
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<p>函数可以视为值：</p>
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<p>x = myFunction(4,3) or x = 12</p>
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<p>在这两种情况下，x 都变为值为 12 的数字。</p>
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<p id="demo"></p>
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<script>
function myFunction(a, b) {
  return a * b;
}
var x = myFunction(4, 3);
document.getElementById("demo").innerHTML = x;
</script>
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</body>
</html>
​