console.log打印对象遇到的一个问题,如下截图 打印结果与预期不符,原因是因为字符串‘a’和对象object拼接在一起,拼成了一个字符串
address:"中国香港"};console.log(user.age);//访问对象中的属性,未定义vari;console.log(i);//变量未赋值functionf(n1){console.log(n1);}varresult=f();//参数未赋值console.log(result);//当函数没有返回值时为undefined</script></body></html>...
dir(object)–is an object inspection method that will list all the properties of an object assert(expression, message[,object])- will display the message or object contents if the expression is false var debugging=false; console.assert(debugging,"You are not debugging"); So there ...
③接着上述代码,typeof arr 和 arr instanceof Array 分别输出object和true。 console.log(typeof(names)); //object console.log(names instanceof Array); //true console.log("" instanceof String); //false 不是对象类型 console.log(true instanceof Boolean); //false 数组对象与方法 Array 对数组的...
functionfunc(a=55){a=99;// updating a does not also update arguments[0]console.log(arguments[0]);}func(10);// 10 并且 js functionfunc(a=55){console.log(arguments[0]);}func();// undefined 规范 Specification ECMAScript® 2026 Language Specification ...
如果使用console.log()将错误消息打印到控制台,则这些消息仅在服务器上可见。 最终用户不会在加载项任务窗格或 Office 应用程序中的任意位置看到这些错误消息。 若要向用户报告错误,请参阅错误通知。 错误代码和消息 下表列出了特定于应用程序的 API 可能返回的错误。
objectIds.forEach(function (objectId) { if (attachments[objectId]) { // process the updated attachments let attachment = attachments[objectId]; } }); }) .catch(function (error) { console.log("attachment query error", error); }); }); } });...
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 ...
/*** Parses a JSON file.** @param path - Full path to the file.* @returns An object containing the JSON data.** @example Parsing a basic JSON file** # Contents of `file.json`* ```json* {* "exampleItem": "text"* }* ```** # Usage* ```ts* const result = parseFile("...
window.addEventListener('scroll', () => {console.log('页面滚动了'); });复制 46. 判断是否为对象 functionisObject(val){returnval !==null&&typeofval ==='object'&& !Array.isArray(val); }复制 47. 获取当前域名 functiongetHost(){returnwindow.location.host; ...