My jump animation only jump for a sec then stop on the air, I think the problem is my value keep resetting. Pls help I have stuck on this for a month now :'(

Questions & Answers
1

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2

You set the IsJumping bool to false in the !IsGrounded() method so this would stop playing the jump animation the moment your player is not touching the ground.

3

If you have Apply Root Motion checked in your Animator, and your Jump animation contains a root animation, this thread may help you solve the problem:
GravityWeight for Root Motion

Setting GravityWeight value to 1 will pull your root animation down using gravity. Otherwise your object will just float down.