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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 函数</h1>
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<p>在这个例子中，myFunction 是一个函数构造函数：</p>
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<p id="demo"></p>
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<script>
function myFunction(arg1, arg2) {
  this.firstName = arg1;
  this.lastName  = arg2;
}
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var x = new myFunction("Bill","Gates")
document.getElementById("demo").innerHTML = x.firstName; 
</script>
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</body>
</html>
​