use string as expression js code example
Example 1: Calculate string value in javascript, not using eval
let str = "12/5*9+9.4*2"
let res1 = eval(str)
console.log('res1:', res1)
let res2 = (new Function('return '+str)())
console.log('res2:', res2)
Example 2: calculate string value in javascript
let res2 = (new Function('return '+str)())