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1. If it is angular or react, newer front-end frameworks support two-way binding;

2. If it is jquery or native js, then you can only operate dom node binding events;

For frameworks, ng or vue, you only need to bind a value to the above two, and the third one is equal to the sum of the first two!

If it is native js or jquery, bind blur or change events to the first and second text boxes! When the event is triggered, the values ??of the first two text boxes are calculated and assigned to the third one!