并为`config`参数设置一个默认值(一个空对象`{}`),以在默认设置足够时跳过第二个参数。 [Try in repl.it](https://repl.it/HK1b/0)```javascriptfunctionquote(str,{char='"',skipIfQuoted=true}={}){constlength=str.length;if(skipIfQuoted&&str[0]===char&&str[length-1]===char){returnstr;...
<!DOCTYPE html> alert("First script Block"); alert("First script Block - Second Line"); Test Page alert("Second script Block"); Some more HTML alert("Third script Block"); function doSomething() { alert("Function in Third script Block"); } 如果您尝试一下,您会看到...
一个function 如果没有显式的通过 return 来返回值给其调用者的话,其返回值就是 undefined 。有一个特例就是在使用new的时候。 JavaScript 中的 function 可以声明任意个形式参数,当该 function 实际被调用的时候,传入的参数的个数如果小于声明的形式参数,那么多余的形式参数的值为 undefined 。 示例: 代码语言:j...
// At the top of the `code` string in the createShaderModule() call @group(0) @binding(0) var<uniform> grid: vec2f; @vertex fn vertexMain(@location(0) pos: vec2f) -> @builtin(position) vec4f { return vec4f(pos / grid, 0, 1); } // ...fragmentMain is unchanged 这在着色...
throw new TypeError("Expected number"); 来看一个简单的例子: function toUppercase(string) { if (typeof string !== "string") { throw TypeError("Expected string"); } return string.toUpperCase(); } 在这里,我们检查函数参数是否为字符串。如果不是,就抛出异常。
“Control character in string: {a}.” : “在字符串中出现了Control的字符”, “Avoid \\’.” : “避免 \\”, “Avoid \\v.” : “避免 \\v”, “Avoid \\x-.” : “避免 \\x-”, “Bad escapement.” : “错误的转义字符”, ...
$ ./index.js./index.js:line1:syntax error near unexpected token `"JavaScript"'./index.js: line 1: `console.log("JavaScript");' 1. 2. 3. 很正常,因为我们并没有指定使用何种解释器来执行上述脚本文件。Hashbang 语法是用来指定脚本文件的解释器是什么,语法规则是在脚本文件头部增加一行代码:#!/usr...
selector string false If a selector is provided, tooltip objects will be delegated to the specified targets. In practice, this is used to also apply tooltips to dynamically added DOM elements (jQuery.on support). See this and an informative example. template string '' Base HTML to use when...
For data attributes, append the option name to data-, as in data-animation="". NameTypeDefaultDescription animation boolean true Apply a CSS fade transition to the tooltip container string | false false Appends the tooltip to a specific element. Example: container: 'body'. This option is ...
This is line 1 This is line 2 This is line 3 As you can see, this method can get quite messy and hard to read when dealing with larger strings. Note: The \n character is a special character that represents a newline. When used in a string, it causes the string to break and st...