js对象的深拷贝

 1 function deepClone(obj) {
 2       var result = Array.isArray(obj) ? [] : {};
 3       for (var key in obj) {
 4         if (obj.hasOwnProperty(key)) {
 5           if (typeof obj[key] === ‘object‘ && obj[key]!==null) {
 6             result[key] = deepClone(obj[key]);   
 7           } else {
 8             result[key] = obj[key];
 9           }
10         }
11       }
12       return result;
13     }