letkeys = Object.keys(JSONObject); leti = 0; while(i < keys.length) { console.log(keys[i] +": "+ JSONObject[keys[i]]); i++; } // forEach()函数遍历JSON对象属性 Object.keys(JSONObject).forEach((key) => { console.log(key
fn) { if (typeof object == "function" && object.call) { //遍历普通对象 fn = Function; } else if (typeof object.forEach == "function" && object.forEach != arguments.callee) { //如果目标已经实现了forEach方法,则使用它自己的forEach方法(如标准游览器的Array对象) object.forEach(block...
for (let paragraph of articleParagraphs) { paragraph.classList.add("read"); } 1. 2. 3. 4. 5. 6. 循环一个拥有enumerable属性的对象 for–of循环并不能直接使用在普通的对象上,但如果我们按对象所拥有的属性进行循环,可使用内置的Object.keys()方法: for (var key of Object.keys(someObject)) { ...
console.log(`${key}:${obj[key]}`) //for...of遍历能直接输出的也是键名, //这里使用的是es6的模板字符串,没有以前的字符串拼接那么麻烦 } 1. 2. 3. 4. 打印输出结果如下: 3)使用forEach()来遍历对象 注意:本质上forEach()是用来遍历数组的,不能遍历对象的,但是可以使用Object.getOnwPropertyName...
forEach(source => { let descriptors = Object.keys(source).reduce((descriptors, key) => { descriptors[key] = Object.getOwnPropertyDescriptor(source, key); return descriptors; }, {}); // By default, Object.assign copies enumerable Symbols, too Object.getOwnPropertySymbols(source).forEach(...
{letsheets = context.workbook.worksheets; sheets.load("items/name");awaitcontext.sync();if(sheets.items.length >1) {console.log(`There are${sheets.items.length}worksheets in the workbook:`); }else{console.log(`There is one worksheet in the workbook:`); } sheets.items.forEach(function(...
Run Code Output 4 58 1440 Here, we can again see thatforEachskips the empty element.thisArgis passed asthisinside the definition of theexecutemethod of theCounterobject. Also Read: JavaScript Array map() JavaScript forEach()
// 1.数据属性 let person = {}; Object.defineProperty(person, "name", { configurable: true, //表示能否通过delete删除属性从而重新定义属性,能否修改属性 enumerable: true, //表示能否通过for-in循环返回属性 writable: true, // 表示是否能修改属性的值 value: "xujiang" // 属性的值 }) /* 在调用...
create(Object.getPrototypeOf(obj)); const propNames = Object.getOwnPropertyNames(obj); propNames.forEach((name) => { const desc = Object.getOwnPropertyDescriptor(obj, name); Object.defineProperty(copy, name, desc); }); return copy; }; const obj1 = { a: 1, b: 2 }; const obj2 = ...
it is completely invisible?`Element is fully visible`:`Element is partially invisible`;});},{root:null,rootMargin:"0px 0px",threshold:1,// The threshold is set to 1, and the callback function is triggered only when the ratio reaches ...