引用类型(Reference type)除了原始类型外,其余类型都属于引用类型,包括Object、Array、Function、Date、RegExp、String、Number、Boolean等等... 实际上Object是最基本的引用类型,其他引用类型均继承自Object。也就是说,所有引用类型的值实际上都是对象。 引用类型的值被称为引用值(Reference value)。 ?简单来说 在多数...
Strings evaluate to false if an empty string '', otherwise true if ([0] && []) { // true // an array (even an empty one) is an object, objects will evaluate to true }15.3 Use shortcuts for booleans, but explicit comparisons for strings and numbers. // bad if (isValid === ...
Template literals or template strings are pretty cool. We don’t have to use the plus (+) operator to concatenate strings, or when we want to use a variable inside a string. The old syntax: With new ES6 syntax: So simple! It’s a really huge difference between the old syntax and ES...
6.2 超过100个字符的字符串不应该用string串联成多行 Why? 被折断的字符串工作起来是糟糕的而且使得代码更不易被搜索 // bad const errorMessage = 'This is a super long error that was thrown because \ of Batman. When you stop to think about how Batman had anything to do \ with this, you ...
(JSStringRef string); //获取字符串长度 size_t JSStringGetLength(JSStringRef string); //转成UTF8字符串 size_t JSStringGetUTF8CString(JSStringRef string, char* buffer, size_t bufferSize); //字符串比较 bool JSStringIsEqual(JSStringRef a, JSStringRef b); bool JSStringIsEqualToUTF8...
// 期望的info类型 { name: string; age: number }functionintroduction(info){consttext='My name is'+info.name+','+info.age+' years old';console.log(text);} 假设一个这样的函数introduction, 接收个人信息并打印在控制台上, 期望的参数形式是一个包含字符串name和数值age的对象,当然用户在使用时可能...
错误提示:开发工具(idea)提示:mutable variable is accessible from closure 浏览器报错提示: 可以正确执行的代码: var yy = document.getElementsByClassName("div_inTop_001"); for (var i = 0; i < yy.length; i++) { yy[i].addEventListener("mouseover", myfunction0000); yy[i].addEventListener("mo...
The advantage of Optional Property is that it can clearly see which properties are there and prevent the passing of properties that do not belong to the interface. interface SquareConfig { color?: string; width?: number; } function createSquare(config: SquareConfig): {color: string; area: nu...
string number boolean null undefined symbol const foo = 1; let bar = foo; bar = 9; console.log(foo, bar); // => 1, 9 标识符不能完全被支持,因此在针对不支持的浏览器或者环境时不应该使用它们。1.2 复杂类型: 当你访问一个复杂类型的时候,你需要一个值得引用。 object array function const ...
[webView loadHTMLString:appHtml baseURL:baseURL]; 1. 2. 3. 4. 再看一下JSBridgeDemoApp这个html文件。 function setupWebViewJavascriptBridge(callback) { // 第一次调用这个方法的时候,为false if (window.WebViewJavascriptBridge) { return callback(WebViewJavascriptBridge); } ...