<!DOCTYPE html> <html> <head> <title>数组的reduce方法</title> </head> <body> </body> <script type="text/javascript"> var obj = { a:{ b:{ c:"maomin" } } } const safeGet = (obj, path) => { try { return path.split('.').reduce((o, k) => o[k], obj) } catch (e) { return undefined } } console.log(safeGet(obj,'a.b.c'));// maomin // 其他练习 var str = "1,2,3,4"; var arr = str.split(","); var newArr = arr.map(Number); console.log(newArr); var sum = newArr.reduce(function(prev, cur, index, arr) { console.log(prev, cur, index); return prev + cur; },0) // 0 1 0 // 1 2 1 // 3 3 2 // 6 4 3 </script> </html>
