SOURCE

const arr = [{
    name: '张三',
    salary: 10000
}, {
    name: '李四',
    salary: 15000
}, {
    name: '王五',
    salary: 20000
}
]
// 计算薪资
let sum = arr.reduce(function (prev, current) {
    // console.log(current)
    return prev + current.salary
}, 0)
console.log(sum)