letvariableName='dynamicVariable'; 1. 这里,我们将变量名存储在variableName变量中。 2. 创建一个对象,用于存储变量 接下来,我们需要创建一个对象,用于存储我们要使用的变量。我们可以使用JavaScript中的对象字面量来创建这个对象: letdynamicObject={}; 1. 这里,我们创建了一个空对象dynamicObject。 3. 将变量存...
The above will create an anonymous function, which when called creates the named function (using the name variable). This functionality is a good substitute for when you can’t useeval()but you need a function with a custom name. Eval is generally useless in ES5 strict mode for a number ...
随机存取存储器(Random Access Memory,RAM)随机存取存储器分为静态随机存取存储器(Static Random Access Memory,SRAM)和动态随机存取存储器(Dynamic Random Access Memory,DRAM)两大类。 在速度上 SRAM 要远快于 DRAM,而 SRAM 的速度仅次于 CPU 内部的寄存器。 在现代计算机中,高速缓存使用的是 SRAM,而主存储器使用...
() to calculate the number of milliseconds since 1970Use setFullYear() to set a specific dateUse toUTCString() to convert today's date (according to UTC) to a stringUse getDay() to display the weekday as a numberUse getDay() and an array to display the weekday as a nameDisplay a ...
How to initialize a variable in JavaScript? After the declaration, we can use the equal(=) sign to assign value to the variable: Example: test =10; where thetestis the name of the variable and is assigned a value of 10. How to declare and initialize the variable together?
14.2 Anonymous function expressions hoist their variable name, but not the function assignment. function example() { console.log(anonymous); // => undefined anonymous(); // => TypeError anonymous is not a function var anonymous = function () { console.log('anonymous function expression'); }...
3.2 Use computed property names when creating objects with dynamic property names. Why? They allow you to define all the properties of an object in one place. function getKey(k) { return `a key named ${k}`; } // bad const obj = { id: 5, name: 'San Francisco', }; obj[getKey...
3.2 Use computed property names when creating objects with dynamic property names. Why? They allow you to define all the properties of an object in one place. function getKey(k){ return `a key named ${k}`; } // bad const obj = { id: 5, name: "foo", }; obj[getKey("enabled"...
constperson = {firstName:"John", lastName:"Doe"}; // Array object: constcars = ["Saab","Volvo","BMW"]; // Date object: constdate =newDate("2022-03-25"); Note A JavaScript variable can hold any type of data. The Concept of Data Types ...
In the preceding example, there are two different variables that have the nameFile. On one hand, there is the function that is only directly accessible inside the IIFE. On the other hand, there is the variable that is declared in the first line. It is assigned the value that is returned...