Can not set DirectionalLightShadow's direction

Questions
1

I set its direction below, but it not works. The light.shadow.camera always lookAt (0,0,0)

  var light = new THREE.DirectionalLight(0xffffff, 1)
  light.position.set(20,0,20)
  light.lookAt(new THREE.Vector3(400,400,400))
  light.castShadow = true

here is my code on codepen:

[codepen] (https://codepen.io/iamnotstone/pen/jzrzge)

2

sorry for this question. I solved myself.
I should using light.target to set the light’s direction.As the documentation said:

The DirectionalLight points from its position to target.position. The default position of the target is (0, 0, 0). Note: For the target’s position to be changed to anything other than the default, it must be added to the scene using

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