数组(Array): 是一种特殊的对象,用于存储有序的数据集合。数组使用数字作为索引来访问元素。let numbers = [1, 2, 3, 4, 5]; console.log(numbers[0]); // 输出: 1 函数(Function): 在JavaScript 中,函数也是对象。它们可以有属性和方法。function myFunction() { // ... } myFunction.description...
“Unexpected early end of program.”:“程序不可预期的提前终止”, “A leading decimal point can be confused with a dot: ‘.{a}’.”:“‘{a}’前的点容易混淆成小数点”, “Use the array literal notation [].”:“使用数组的符号 []“, “Expected an operator and instead saw ‘{a}’.”...
“Unexpected early end of program.”:“程序不可预期的提前终止”, “A leading decimal point can be confused with a dot: ‘.{a}’.”:“‘{a}’前的点容易混淆成小数点”, “Use the array literal notation [].”:“使用数组的符号 []“, “Expected an operator and instead saw ‘{a}’.”...
对象成员的值可以是任意的,在我们的person对象里有数字(Number),字符串(string),数组(array),函数(function)。前3个成员是资料项目,被称为对象的属性(property),greeting成员是函数,允许对象对资料做一些操作,被称为对象的方法(method)。 点表示法(Dot notation) 使用了点表示法(dot notation)来访问对象的属性和...
“A leading decimal point can be confused with a dot: ‘.{a}’.”:“‘{a}’前的点容易混淆成小数点”, “Use the array literal notation [].”:“使用数组的符号 []“, “Expected an operator and instead saw ‘{a}’.”:“需要用一个符号来代替’{a}’”, ...
不过constArray["shift"]()这种写法看起来很不习惯,最好能改成constArray.shift()—— 这就需要借助一下 ESLint 了。将当前目录初始化为 npm module 项目,安装并初始化 eslint,然后在配置里添加一条规则: "dot-notation": "error" 这时候 VSCode 会提示 ...
第二个问题是开发者使用数组构成器来创建数组,技术上是正确的,然而会比文字符号(literal notation)慢 解决办法:使用文字符号来初始化数组,不要预定义数组长度。 var myArray = []; 3. 未定义属性 Undefined properties举例: var myObject = { someProperty: value, someOtherProperty: undefined } ...
4.1 Use the literal syntax for array creation. eslint: no-array-constructor // bad const items = new Array(); // good const items = []; 4.2 Use Array#push instead of direct assignment to add items to an array. const someStack = []; // bad someStack[someStack.length] = '...
Script code must always obtain a reference to a by-reference script wrapper in order to insert or overwrite a value in a by-reference array wrapper. The JavaScript array wrapper supports the following operations: length –Returns the count of the members in the array. []item syntax –Enables...
properties (default: true)— rewrite property access using the dot notation, for example foo["bar"] → foo.bar pure_funcs (default: null)— You can pass an array of names and UglifyJS will assume that those functions do not produce side effects. DANGER: will not check if the name is ...