即转换为Json字符串，再转换为对象，这边是es6写法：
export
let cloneObj =
function (obj) {
let str, newobj = obj.constructor ===
Array ? [] : {};
if (
typeof obj !==
'object') {
return;
}
else if (window.JSON) {
str =
JSON.stringify(obj);
newobj =
JSON.parse(str);
}
else {
for (
let i
in obj) {
newobj[i] =
typeof obj[i] ===
'object' ?
cloneObj(obj[i]) : obj[i];
}
}
return newobj;
};
