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;...
// Extract a portion of the string and store it in a new variable var sliceString = newString.slice(newString.indexOf("l")+2,newString.length); alert(sliceString); // The split function creates a new array containing each value separated by a space stringArray = concatString.split(" ...
In the early days of JavaScript, creating multiline strings was a bit cumbersome. If you wanted to create a string that spanned more than one line, you had to use the newline character (\n) to break the line, or concatenate multiple strings using the + operator. Here's an example: ...
Newline, a special character or sequence of characters signifying the end of a line of text Electrical termination, at the end of a wire or cable to prevent an RF signal from being reflected 二、代码实现 String.prototype.trim() 浏览器兼容脚本 代码语言:javascript 代码运行次数:0 if(!String.p...
new 关键字执行过程 new 构造函数可以在内存中创建了一个空的对象 this 就会指向刚才创建的空对象 执行构造函数里面的代码,给这个空对象添加属性和方法 返回这个对象(因此不需要 return) 遍历对象 for in 遍历我们的对象 for (var k in obj) { console.log(k); // 得到的是 属性名 ...
`A long string with the number. It’s so long that we don’t want it to take up space on the .map line!` )); // 总是添加() // bad [1, 2, 3].map(x => { const y = x + 1; return x * y; }); // good [1, 2, 3].map((x) => { ...
Even though it's slower than string concat, that shouldn't realistically matter as you can still do 2 million of those a second. Convenience over micro performance always.Install$ npm install multiline UsageEverything after the first newline and before the last will be returned as seen below...
That’s an empty return, followed by a block with the labelnamein front of the expression statement'John'. After the block, there is an empty statement. Pitfall: ASI might unexpectedly not be triggered Sometimes a statementin a new line starts with a token that is allowed as a continuation...
Here's an example of a "string" diff:# Command-Line Usage mocha [spec..] Run tests with Mocha Commands mocha inspect [spec..] Run tests with Mocha [default] mocha init <path> create a client-side Mocha setup at <path> Rules & Behavior --allow-uncaught Allow uncaught errors to ...
eslint: no-new-func Why? Creating a function in this way evaluates a string similarly to eval(), which opens vulnerabilities. // bad const add = new Function('a', 'b', 'return a + b'); // still bad const subtract = Function('a', 'b', 'return a - b');...