join() 方法将一个数组(或一个类数组对象)的所有元素连接成一个字符串并返回这个字符串,用逗号或指定的分隔符字符串分隔。如果数组只有一个元素,那么将返回该元素而不使用分隔符。 尝试一下语法 jsCopy to Clipboard join() join(separator) 参数 separator 可选 指定一个字符串来分隔数组的每个元素。
例如,数组的join()函数的参数是可选的: jsCopy to Clipboard constmyArray=["我","爱","巧克力","青蛙"];constmadeAString=myArray.join(" ");console.log(madeAString);// 返回“我爱 巧克力 青蛙”constmadeAnotherString=myArray.join();console.log(madeAnotherString);// 返回“我,爱,巧克力,青蛙”...
console.log(arr.toString()); // 1,2,3 // 2. join(分隔符) var arr1 = ['green', 'blue', 'pink']; console.log(arr1.join()); // green,blue,pink console.log(arr1.join('-')); // green-blue-pink console.log(arr1.join('&')); // green&blue&pink 结果: 1,2,3 green,...
Array.prototype.join() join()方法将数组中的所有元素连接成一个字符串。 语法 str=arr.join([separator= ',']) 参数 separator 可选,用于指定连接每个数组元素的分隔符。分隔符会被转成字符串类型;如果省略的话,默认为一个逗号。如果seprator是一个空字符串,那么数组中的所有元素将被直接连接。
functionfunc(a=55){a=99;// updating a does not also update arguments[0]console.log(arguments[0]);}func(10);// 10 并且 js functionfunc(a=55){console.log(arguments[0]);}func();// undefined 规范 Specification ECMAScript® 2026 Language Specification ...
consthome="c:\\temp"; 也可以在换行之前加上反斜杠以转义换行。这样反斜杠和换行都不会出现在字符串的值中。 js conststr="this string \ is broken \ across multiple \ lines.";console.log(str);// this string is broken across multiple lines....
join("-"); // 数组转为字符串 "1-2-3-4-5-6" [1, 2, 3].toString(); // 转换为字符串,相当于join(','); "1,2,3" [1, 2, 3].map(item => item * 2); // 映射器 [2, 4, 6] [1, 2, 3].reduce((acc, curr) => { return acc + curr; }); // 累加器 从左到右...
console.log(user.join(',')) //将数组变为了字符串,并用,号连接,变为字符串后,用user.split(','),按,号拆分,又可将字符串变为数组 6. 数组去除重复 Array.prototype.distinct = function() { var arr = this, result = [], i, j, len = arr.length; for (i = 0; i < len; i++) {...
If you want to talk to us, ask questions, and find out more, join the discussion on the MDN Web Docs chat room on Matrix.TroubleshootingSome common issues and how to resolve them.Error: ENOSPC: System limit for number of file watchers reachedThere are two options to resolve this....
If you want to talk to us, ask questions, and find out more, join the discussion on theMDN Web Docs chat roomonMatrix. Troubleshooting Some common issues and how to resolve them. Error: ENOSPC: System limit for number of file watchers reached ...