要想解决循环援用,咱们须要借助 Set 或者 Map 或者 WeekMap 类型,来保留对象之间的援用关系
话不多说,间接上代码:
function isObject(obj) {return (typeof obj === "object" || typeof obj === "function") && obj !== null;
}
function cloneDeep(source, hash = new Map()) {if (!isObject(source)) return source;
if (hash.has(source)) return hash.get(source);
var target = Array.isArray(source) ? [] : {};
hash.set(source, target);
for (var key in source) {if (Object.prototype.hasOwnProperty.call(source, key)) {if (isObject(source[key])) {target[key] = cloneDeep(source[key], hash);
} else {target[key] = source[key];
}
}
}
return target;
}
其实浏览器也有解决方案,只不过还未正式公布