原因就出在 a.code-b.code 这个字符串下相减的操作是一个NAN导致sort 入参错误 a.code 和b.code 两个属性都是字符串,根本原因出在 "-" 减号。减号操作得数最终都会变成数组,这个NAN也会被判别为数字 参考链接:https://www.codenong.com/37301296/ 所以在排序时 比较字符串得时候不可以直接相减。
Python code to demonstrate why 'nan == nan' is False while nan in [nan] is True # Import numpyimportnumpyasnp# Creating a numpy arrayarr=np.array([np.nan,np.nan,np.nan])# Display original arrayprint("Original array:\n",arr,"\n")# Checking nan with ==print("Is",arr[0],...
deletewindow// falsevara;deletea;// false// 有意思的delete thisfunctiona(){this.a=333;console.log("delete this:",deletethis);// trueconsole.log("a",this.a,this);// 333, {a:333}} a.call({}); 数据属性configurable为false的属性 ES5严格模式中delete configuable为false的对象时会直接抛异...
loads()方法反序列化出对象 (2)更方便的是采用python中json库的做法 def dumps(obj, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw): json.dumps(dict)接受一个必须参数(如dict),结果是...
delete NaN; // falsedelete Infinity; // falsedelete undefined; // false复制代码 6. 函数声明 function fn() {}delete fn;console.log(fn.toString()); // function fn() {}复制代码 更多细节 ECMA-262_5th_edition_december_2009.pdfECMA-262_3rd_edition_december_1999.pdf58页JavaScript中delete操作...
AdomdConnectionException This is usually a temporary error during hostname resolution and means that the local server did not receive a response from an authoritative server Advice on Connecting to an IP Camera using C# App? AES encrypt in Javascript and decrypt in C# AES Encryption issues (Paddin...
Find out why you should not modify a JavaScript object prototype and what to do insteadTHE SOLOPRENEUR MASTERCLASS Launching June 24th As programmers, one of the skills we must first learn is how to search for a solution.Google is your friend. And most of the times a StackOverflow answer...
That is why 'issubclass(MySequence, collections.abc.Sequence)' would return 'False' even if 'MySequence' had all the methods defined. class MyAbcSequence(collections.abc.Sequence): def __init__(self, a): self.a = a def __len__(self): return len(self.a) def __getitem__(self, i...
JavaScript's strict mode, introduced in ECMAScript 5, is a way to opt in to a restricted variant of JavaScript, thereby implicitly opting-out of "sloppy mode". Strict mode isn't just a subset: it intentionally has different semantics from normal code. Br
false, 0, NaN, null, undefined, "" No object (including arrays) will convert to false. In this case, the return value of document.getEle mentById is either null (false) or a DOM node (an object, i.e., true). [color=blue][color=green] > > being a Javascript novice, an...