JS深拷贝/深克隆（面试用）

function deepClone(obj){
    if(Object.prototype.toString.call(obj)==="[object Function]"){
        let str=obj.toString();
        /^function\s*\w*\s*\(\s*\)\s*\{(.*)/.test(str);
        let str1=RegExp.$1.slice(0,-1);
        return new Function(str1);
    }
    if(!obj||typeof obj!=="object")
        return obj;
    if(Object.prototype.toString.call(obj)==="[object Date]")
        return new Date(obj);
    if(Object.prototype.toString.call(obj)==="[object RegExp]")
        return new RegExp(obj);
    let cloneObj=Array.isArray(obj)?[]:{};
    for(let i in obj){
        if(obj.hasOwnProperty(i)){
            cloneObj[i] = typeof obj[i] === 'object' ? deepClone(obj[i]) : obj[i];
        }
    }
    return cloneObj;
}