function cartesian() {
var r = [], arg = arguments, max = arg.length-1;
function helper(arr, i) {
for (var j=0, l=arg[i].length; j<l; j++) {
var a = arr.slice(0); // clone arr
a.push(arg[i][j]);
if (i==max)
r.push(a);
else
helper(a, i+1);
}
}
helper([], 0);
return r;
}
用法：
cartesian([0,1], [0,1,2,3], [0,1,2]);
要使函数采用数组数组，只需将签名更改为，functioncartesian(arg)从而将arg其作为参数而不是allarguments。
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