JavaScript中对象的深复制

纯干货

function cloneObj(source,target){
            if(target===undefined) target={};
            var names=Object.getOwnPropertyNames(source);
            for(var i=0;i<names.length;i++){
                var desc=Object.getOwnPropertyDescriptor(source,names[i]);
                if(typeof desc.value==="object" && desc.value!==null){
                    var obj;
                    switch(true){
                        case desc.value.constructor===Date://当标签为日期时
                            obj=new Date(desc.value.toString());
                            break;
                        case desc.value.constructor===RegExp://当value为正则表达式时
                            obj=new RegExp(desc.value.source,desc.value.flags);
                            break;
                        case HTMLElement.isPrototypeOf(desc.value.constructor)://当value为html标签时
                            obj=document.createElement(desc.value.nodeName);
                            break;
                            default:
                                obj=new desc.value.constructor();
                    }
                    Object.defineProperty(target,names[i],{
                        enumerable:desc.enumerable,
                        writable:desc.writable,
                        configurable:desc.configurable,
                        value:obj
                    });
                    cloneObj(desc.value,obj)
                }else{
                    Object.defineProperty(target,names[i],desc);
                }
            }
            return target;
        }
        var o={a:1};
        o=cloneObj(obj);
        obj.d.h.j[1]=100;
        console.log(o);