After edit then use function getJson to get the context, the number would be transformed to String

[aneathesia]

How do I keep the data type unchanged？

[GBonnaire]

You can use event onbeforechange(element, cell, x, y, value) and return your data casted as you want

for example

onbeforechange: function(el, cell, x, y, value) {
     if(el.jspreadsheet.options.columns[x].type == "number") {
             return new Number(value);
     }

    return value;
}

code not tested

[aneathesia]

Your method really works, and this problem have noted in the document i missed that. In addition, even set the column type to number but after edit the output data type will still mismatch, the problem may in this new return value type. Your code is definitely helpful.Thanks!

[GBonnaire]

Try with that: maybe it's new Number is not good.

onbeforechange: function(el, cell, x, y, value) {
            if(el.jspreadsheet.options.columns[x].type == "numeric") {
                    return +value;
            }

           return value;
       },

I have checked and i have good result in JSON