match()方法是最常用的String正则表达式方法。它的唯一参数就是一个正则表达式(或通过RegExp()构造函数将其转换为正则表达式),返回的是一个由匹配结果组成的数组。 "1 plus 2 equals 3".match(/\d+/g) // 返回 ["1", "2", "3"] 例如,使用如下的代码来解析一个URL: var url = /(\w+):\/\/(
这里推荐一款强大的字符串转换工具——String Manipulation。 它强大到什么程度,看下他的功能列表你就知道了:  文本转换操作 切换样式(camelCase, hyphen-lowercase, HYPHEN-UPPERCASE, snake_case, SCREAMING_SNAKE_CASE, dot.case, words lowercase, Words Capitalized, PascalCase) 转换为SCREAMING_SNAKE_CASE (...
let data=JSON.parse(text,function(key,value){ //删除以下划线开头的属性和值 if(key[0]==="_") return undefined; //如果值是ISO 8601格式的日期字符串,则转换为Date if(typeof value === "string"&& /^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d.\d\d\dZ$/.test(value)){ return new...
var x = Boolean(0);if (x) {alert('hi'); // This will never be alerted.}typeof Boolean(0) == 'boolean';typeof new Boolean(0) == 'object';有时用作 number, string 或 boolean时, 类型的转换会非常实用.多级原型结构 不是首选 多级原型结构是指 JavaScript 中的继承关系. 当你自定义一...
string 在js 里面表示一个字符串字面量有三种方式,单引号,双引号,或者反引号,反引号表示法又叫模板字符串,是 ES6 的新语法: '使用单引号表示字符串'; // prettier-ignore "使用双引号表示字符串";; `使用模板字符串表示字符串`; 如果你要在字符串里面插入单引号或者双引号可以使用反引号: `I'm a progra...
id String |null |undefined An identifier used to refer to the basemap when referencing it elsewhere. Example const customBasemap = new Basemap({ baseLayers: [layers], title: "Custom Basemap", id: "myBasemap" }); loadError Property loadError Error |null |undefinedreadonly The Error obje...
For instance, JavaScript might convert a string to a number during an arithmetic operation. While this can simplify some code, it can also lead to unexpected results if not handled carefully.Explicit Typing: Unlike implicit typing, explicit typing involves manually converting a value from one type...
{ getTimeToNextUpdateForUnit(unit: string): number?, // Returns "time to next update" for a time unit. // This is what the library calls internally // when `formatAs` is configured for a `step`. // Example: `getTimeToNextUpdateForUnit('minute')`. // Can return `undefined` in...
id String The unique ID assigned to the layer. Layer imageFormat String|null|undefined The map image format (MIME type) to request. WMSLayer imageMaxHeight Number Indicates the maximum height of the image exported by the service. WMSLayer imageMaxWidth Number Indicates the maximum width of the...
The code between the equals sign and the semicolon is an expression. The parentheses are not necessary, but I find the conditional operator easier to read if I put it in parens. Using ambiguous expressions as statements Twokinds of expressions look like statements—they are ambiguous with regard...