这是我在原基础上改的，多了一个判断 function matchesPattern(str) { let arr = []; arr = str.split('-'); console.log(arr) if (arr[0].length != 3 || arr[1].length != 3 || arr[2].length != 4) { return false } for (key in arr) { let oldLen = arr[key].length; console.log(oldLen) arr[key] = parseInt(arr[key]); console.log(arr[key].toString().length) if (oldLen != arr[key].toString().length) { return false } else { var temp = true } } return temp }