JAVASCRIPT-JS Analysis of custom formulas and calculation problems

The effect that needs to be achieved is that when two input is entered at the time it is worthwhile to parse the back end of the formula and input the results into the specified text box synchronously, how can this be achieved?

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The effect that needs to be achieved is that when two input is entered at the time it is worthwhile to parse the back end of the formula and input the results into the specified text box synchronously, how can this be achieved?

You should use the MVVM framework

Try http://vuejs.org/.

The discovery can actually not be so troublesome, the direct substitution is good:

https://jsfiddle.net/hsfzxjy/Lk1mu0cw/1/

