离子3-打字稿错误：算术操作数必须为“ any”，“ number”或枚举类型

Question

I have a click action when a user click on a like button for increment the number but when build or run the ionic app, i have a typescript error, can someone help me out with the solution?

Typescript Error
An arithmetic operand must be of type 'any', 'number' or an enum type.
src/pages/comments/comments.ts
document.getElementById("like-" + commentid).innerHTML++

In comments.ts

likedislike(type,commentid) {
  if(type === 'like') {
    document.getElementById("like-" + commentid).innerHTML++
  }
}

Answer 1

Try to use Number() to cast the inner html string to number.

var x = document.getElementById("like-" + commentid).innerHTML; 

document.getElementById("like-" + commentid).innerHTML = Number(x) + 1

It is way beter to do this with Angular data binding in Ionic though...