javascript - Why do I get "X is not a function" in the following recursive function? -

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i'm using following code animate opacity of element:

      var opacity = 0 // starting opacity       var step = 0.1 // step size       var target = 1 // target value       var time = 50 // delay in milliseconds       // start timer loop, , record it's index       var increaseopacity = setinterval(function () {         // assuming selector works, set opacity         $(`#pano-${index}`).attr({ opacity: opacity })         // increment opacity step size         opacity += step         // if reached our target value, stop timer         if (opacity >= target) {           clearinterval(increaseopacity)         }       }, time)        $('.pano').attr({ opacity: 0 })       increaseopacity()

it works. however, uncaught typeerror: increaseopacity not function every time run function.

why , how fix it?

however, uncaught typeerror: increaseopacity not function every time run function.

increaseopacity not function object, identifier timer clearinterval can stop , clear timer later.

why , how fix it?

you can remove function call since automatically invoked setinterval method.


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