Object.values(obj); // [1, 2] 四、Object.getOwnPropertyDescriptors 4.1 返回值 Object.getOwnPropertyDescriptors() 方法用来获取一个对象的所有自身属性的描述符 4.2 语法 Object.getOwnPropertyDescriptors(obj); 4.3 例子 let obj = {a: 1, b: 2}; Object.getOwnPropertyDescriptors(obj); // [a: ...
//定义一个Object字面量对象,当着Key-value集合使用 var objectMap={}; objectMap[jack]=jack.name; //向对象中添加元素,使用对象作为key objectMap[mark]=mark.name; console.log(objectMap[jack],objectMap[mark]); console.log(objectMap["[object Object]"]); 输出结果如图5-5所示: 图5-5 Object作...
if (*new_capacity <= JSObject::kMaxUncheckedOldFastElementsLength || (*new_capacity <= JSObject::kMaxUncheckedFastElementsLength && ObjectInYoungGeneration(object))) { return false; } return ShouldConvertToSlowElements(object.GetFastElementsUsage(), *new_capacity); } 当慢数组的元素可存放在快数...
The Object.prototype property represents the Object prototype object. 这个属性表示了Object这个构造函数的原型对象。 Object.getOwnPropertyDescriptor() Object.getOwnPropertyDescriptor(obj, prop)The Object.getOwnPropertyDescriptor() method returns a property descriptor(返回的是一个对象) for an own property...
("SELECT * FROM test WHERE col1 BETWEEN $start AND $end");13stmt.getAsObject({$start:1, $end:1});//{col1:1, col2:111}1415//Bind new values16stmt.bind({$start:1, $end:2});17while(stmt.step()) {//18varrow =stmt.getAsObject();19console.log('Here is a row: ' +JSON....
example.com/"); doing so will cause the virtual console to emit a "jsdomError" explaining that this feature is not implemented, and nothing will change: there will be no new Window or Document object, and the existing window's location object will still have all the same property values....
options(Object):语句执行的选项,为 JS 对象。可配置属性具体如下: callback(Function):执行完 executeMany 后的回调函数。参数如下: 下面通过一个简单的例子来说明 executeMany 用法。 conn.executeMany( "insert into PERSON values(:1, :2, :3)",
All of the preceding functions have a parameter whose type is object. In addition to the data returned by each API, another common property named errMsg is returned. The value format of this property is as follows: For a successful call: xxx:ok, where xxx is the name of the API being ...
You can minify more than one JavaScript file at a time by using an object for the first argument where the keys are file names and the values are source code: var code = { "file1.js": "function add(first, second) { return first + second; }", "file2.js": "console.log(add(1 ...
Get the position of element inside an array, or -1 if not found.$.isArray $.isArray(object) ⇒ boolean True if the object is an array.$.isFunction $.isFunction(object) ⇒ boolean True if the object is a function.$