克隆 JSON

function deepCopy(f, s) {
     if (!Object.keys(s).length) return;
     for (var i in s) {
         if (typeof s[i] === ‘object‘ && !!s[i]) {
             f[i] = s[i].constructor === Array ? [] : {};
             deepCopy(f[i], s[i]);
         }
         else {
             f[i] = s[i];
         }
     }
}

function deepCopy(s) {
    if (!Object.keys(s).length) return;
    var json = {};
    var copy = function (f, s) {
          for (var i in s) {
                if (typeof s[i] === ‘object‘ && !!s[i]) {
                　　f[i] = s[i].constructor === Array ? [] : {};
                　　copy(f[i], s[i]);
             　 }
                else {
                　　f[i] = s[i];
             　 }　　
          }
     };
     copy(json, s);
     return json;
}