JavaScript数组方法之reduce-左侧累计
<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>三十课 - JavaScript数组方法之reduce-左侧累计</title> <script src="http://res.30ke.cn/u/js/console.js"></script> </head> <body> <div id="main"></div> <script> const array1 = [1, 2, 3, 4]; const reducer = (accumulator, currentValue) => accumulator + currentValue; // 1 + 2 + 3 + 4 console.log(array1.reduce(reducer)); // 输出 10 // 5 + 1 + 2 + 3 + 4 console.log(array1.reduce(reducer, 5)); // 输出 15，其中5是累计器初始值 </script> </body> </html>
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三十课
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