递归深拷贝

var deepCopy = function(obj) { if (typeof obj !== 'object') return; var newObj = obj instanceofArray ? [] : {}; for (var key in obj) { if (obj.hasOwnProperty(key)) { newObj[key] = typeof obj[key] === 'object' ? deepCopy(obj[key]) : obj[key]; } } return newObj; }