它们都返回一个遍历器对象,可以用for…of循环进行遍历,唯一的区别是keys()是对键名的遍历、values()是对键值的遍历,entries()是对键值对的遍历. 1. Array的keys()和values()还有entries()方法 let arr = ['a', 'b', 'c']for(let index of arr.keys()) { console.log(index); }//0//1//2for(...
Array.from() 转换成数组 此方法可以将一些可迭代的以及为数组的数据转换成真正的数组,并返回一个那个新数组,比如字符串,dom伪数组等,接收两个参数,第一个为要转化的参数,第二个是一个回调函数(可选),回调函数有两个参数当前遍历的对象和索引 const newArr = Array.from("March"); console.log( newArr);...
workerWithName = new Worker('work.js', {name: 'worker2'}) // 为Worker线程命名,那么在Worker线程内的代码可通过 self.name...const uInt8Array = new Uint8Array(new ArrayBuffer(10))...) // 以先序列化后反序列化的方式发送二进制数据,发送后主线程仍然能访问uInt8Array变量的数据,但会造成性能...
Copies array elements to a new array with the same underlying data type as the host array. var arr1 = new Float32Array( [ 1.0, 2.0, 3.0 ] ); var arr2 = arr1.slice(); var bool = ( arr1 === arr2 ); // returns false bool = ( arr1.buffer === arr2.buffer ); // return...
Array.prototype.split()并不是 JavaScript 中数组的一个方法。你可能混淆了String.prototype.split()方法,该方法用于将字符串分割成子字符串数组。 基础概念 String.prototype.split()方法通过指定的分隔符将一个字符串分割成多个子字符串,并返回这些子字符串组成的数组。如果没有指定分隔符,则整个字符串会被当作一...
do_something_with_err(); }) queryStream 参数 sql(String):查询 SQL 或 PL/SQL 语句,可包含绑定变量。 bindParams(Object):绑定参数,按照名称绑定时,为 JS 对象,按照位置绑定时,为 Array 数组。可配置属性具体如下: options(Object):语句执行的选项,为 JS 对象。可配置属性具体如下: ...
This includes things like window.Array, window.Promise, etc. It also, notably, includes window.eval, which allows running scripts, but with the jsdom window as the global: const dom = new JSDOM(` document.getElementById("content").append(document.createElement("hr")); `, { runScripts:...
of fields the same way as in thedatalize()function. You can nest containers within containers or supplement them with.array()filters, which converts values to arrays. When the.array()filter is used without a container, the specified rules or filters are applied to every value in the array...
One of the M:JavaScriptCore.JSValue.From* method overloads is used to assign values to the JavaScript variables arg1 and arg2. The EvaluateScript(String, NSUrl) method evaluates the JavaScript and returns the result, which is converted back into a .NET object with the ToInt32() method.C#...
// Only use secure WebSocketsconstpusher =newPusher(APP_KEY, {cluster: APP_CLUSTER,enabledTransports: ['ws'],forceTLS:true}); disabledTransports(Array) Specifies which transports must not be used by pusher-js to establish a connection. This settings overwrites transports whitelisted via theenable...