console.log(typeofstr);//stringconsole.log(typeofarr);//objectconsole.log(typeofobj);//objectconsole.log(typeofnum);//numberconsole.log(typeofb);//booleanconsole.log(typeofn);//null是一个空的对象console.log(typeofu);//undefinedconsole.log(typeoffn);//function typeof检测的Array和Object...
* @param {Object} value 元素值 */function isInArray(arr,value){ var index = $.inArray(value,arr); if(index >= 0){ return true; } return false; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 方法六、include()方法: arr.includes(searchElement)方法用来判断一个数组是否包含一个指定...
都是除零和 NaN 外的其它同一个数字 Object.is('foo','foo');// trueObject.is(window,window);// trueObject.is('foo','bar');// falseObject.is([], []);// falsevarfoo = { a:1};varbar = { a:1};Object.is(foo, foo);// trueObject.is(foo, bar);// falseObject.is(null,nul...
虽然很简单,就是个for循环,if判断。。 但也可能会有同学表示晕啊,看不懂。 看不明白不要紧,我大概讲下,具体怎么比较的。。 首先我们看这个函数,它接收一个数组做为参数, 那传入之后, 在这个函数中的arr就是一个数组,对它使用join方法, 将这个数组转为一个字符串,并用逗号分隔。 然后呢,声明一个变量b,把...
// 类型检查 export function isObject(obj) { return Object.prototype.toString.call(obj) === '[object Object]' } // typeof null //"object" // typeof {} //"object" // typeof [] //"object" // typeof function foo(){} //"function" (特殊情况) export function isObjectCopy(obj) ...
TypeScript2.3 引入了一个新的--downlevelIteration标志,为以 ES3 和 ES5 目标添加了对 ES6 迭代协议的完全支持。for...of循环现在可以用正确的语义进行向下编译。 使用for...of遍历数组 假设咱们现在的tsconfig.json设置target为 es5: 代码语言:javascript ...
toString(); // "Hello,An" Object.prototype.toString.call(an); // "[object Array]" 这种方法对于所有基本的数据类型都能进行判断,即使是 null 和 undefined 。 Object.prototype.toString.call("An"); // "[object String]" Object.prototype.toString.call(1); // "[object Number]" Object....
1. API Intro Applicable object:Common modeInstitutional mode Request Url:https://apihk.mch.weixin.qq.com/v3/global/papay/contracts/jsapi-pre-entrust-sign Request method:POST Pathparameter is a path parameter. Queryparameter needs to be passed in the request URL. ...
The method takes a URL string, as well as a few options which you should pass through unmodified if calling super.fetch(). It must return a promise for a Node.js Buffer object, or return null if the resource is intentionally not to be loaded. In general, most cases will want to ...
blob: a Blob object representing the file to load. source_file_handle: a corresponding file handle for the file, as defined by your system.Sorry for the quirky API. The API is new, and parts of it have not been designed at all. This was just a hack that I came to depend on, ...