这道 JS 题目最快的办法是什么？

use case1:
Input:['aa','bb','cc'],['dd','ee']
Output:["aadd", "aaee", "bbdd", "bbee", "ccdd", "ccee"]

use case2:
Input:['aa','bb','cc'],['dd','ee'],['ff','gg','hh']
Output:["aaddff", "aaddgg", "aaddhh", "aaeeff", "aaeegg", "aaeehh", "bbddff", "bbddgg", "bbddhh", "bbeeff", "bbeegg", "bbeehh", "ccddff", "ccddgg", "ccddhh", "cceeff", "cceegg", "cceehh"]

输入参数不定

方式 1 大概 250 - 300ms:

var mergeArr = (...args) => {
	
	const mergeString = (a,b) => {
		var s = '';

		for (var i = 0 , len = b.length; i < len; i++){
			if(i !== 0) s += ',';
			s += a.join(b[i] + ',') + b[i];
		}
		
		var arr = s.split(',');
		return arr;
	}

	var arrs = Array.apply(null, args);

	var arrData = arrs[0];
	for (var i = 1,len = arrs.length ; i < len; i++)
		arrData = mergeString(arrData,arrs[i]);

	// console.log(arrData);
};

方式 2 180 - 250 ms

function all() {
    var pro = ''
    for (var i = 0; i < arguments.length; i++) {
        var obj = JSON.stringify(arguments[i]);
        if(i !== arguments.length-1){
            pro = pro + `
                var outArr = []
                function p${i}(str) {
                    for (var i = 0; i < ${obj}.length; i++) {
                        var obj = str + ${obj}[i];
                        p${i+1}(obj)
                    }
                };`
        }else{
            pro = pro + `
                function p${i}(str) {
                    for (var i = 0; i < ${obj}.length; i++) {
                        var obj = str + ${obj}[i];
                        outArr.push(obj)
                    }
                };
                p0('')
                console.log(outArr)
                `
            eval(pro)

        }
    }
}

测试数据：

var time = new Date().getTime();
// mergeArr(['aa','bb','cc'],['dd'],['ee','ff']);
mergeArr(['aa','bb','cc'],['dd','ee'],['ff','gg','hh'],['dd','ee'],['ff','gg','hh'],['dd','ee'],['ff','gg','hh'],['dd','ee'],['ff','gg','hh'],['dd','ee'],['ff','gg','hh'],['ff','gg','hh'],['dd','ee'],['ff','gg','hh']);
console.log(new Date().getTime() - time);

还有更好的办法吗？