The variables in the code were cleared inexplicably, as shown in the figure below:

code show as below:

function rolldiceSumProb(arr, sides){ let prob, result=[]; let dig = function(target, count, methods) { if (count > sides) return false console.log('dig', target, count) for (let i=1; i<=6; i++) { console.log('target:', target, 'count:', count, 'cur_i:', i, target+i==arr, sides==count) if (target+i==arr && sides==count) { methods.push(i) result.push(methods) console.log(methods, result, 'quit') methods.pop() return false } else { methods.push(i) if (target+i < arr) dig(target+i, count+1, methods) methods.pop() } } } dig(0, 1, []) console.log('res', result) return prob; } rolldiceSumProb(11, 2)