代码语言：javascript
复制 * @param {string} digits
* @return {string[]}
* 输入："23"
* 输出：["ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf"].
*/
var letterCombinations = function (digits) {
//存储键盘值
if(digits==""){
return
}
let code = ["", "1", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"]
let str = digits.split("")
let newCode = []
for (let i = 0, len = str.length; i < len; i ) {
newCode.push(code[str[i]])
}
let count = (newCode) => {
let arr = []
if(newCode.length==1){
for(i=0,iL=newCode[0].length;i<iL;i ){
arr.push(newCode[0][i])
}
return arr
}
for (let k = 0, KLen = newCode[0].length; k < KLen; k ) {
for (let j = 0, jLen = newCode[1].length; j < jLen; j ) {
arr.push(`${newCode[0][k]}${newCode[1][j]}`)
}
}
newCode.splice(0, 2, arr)
if (newCode.length > 1) {
count(newCode)
}
return newCode[0]
}
return count(newCode)
};
console.log(letterCombinations("23"))
