Question

我需要对同一对象的2个属性（myTodos）执行算术加法喜欢让metleft = myTodos.meetings-myTodos.meetDone。

我希望得到一些数字，但实际结果显示为'Nan'

我首先尝试为metleft声明一个值，然后也使用parseInt进行尝试，但结果仍显示为“ NaN”

让metleft = 0 Meetleft = parseInt（myTodos.meetings-myTodos.meetDone）

但这也不起作用。

let myTodos = {
    day:'monday',
    meetings: 0,
    meetdone: 0,
}
let addMeetings = function(todo,meet=0) {
    todo.meetings = todo.meetings+meet
}

let meetDone = function(todo,meet=0) {
    todo.meetdone = todo.meetdone-meet
}
let restDay = function(todo) {
    todo.meetings=0
    todo.meetDone=0
}
let getSummaryOfDay = function(todo) {
    let meetleft =   todo.meetings + todo.meetDone
    console.log(meetleft)
}
addMeetings(myTodos,4)
addMeetings(myTodos,2)
meetDone(myTodos,5)
getSummaryOfDay(myTodos)

上述代码iam预期结果为1，但实际结果为NaN

Answer 1

请注意meetdone和meetDone属性。对象属性区分大小写。

这是工作示例：

let myTodos = {
    day:'monday',
    meetings: 0,
    meetdone: 0,
}
let addMeetings = function(todo,meet=0) {
    todo.meetings = todo.meetings+meet
}

let meetDone = function(todo,meet=0) {
    todo.meetdone = todo.meetdone-meet
}
let restDay = function(todo) {
    todo.meetings=0
    todo.meetdone=0
}
let getSummaryOfDay = function(todo) {
    let meetleft =   todo.meetings + todo.meetdone
    console.log(meetleft)
}
addMeetings(myTodos,4)
addMeetings(myTodos,2)
meetDone(myTodos,5)
getSummaryOfDay(myTodos)

Answer 2

正确的代码如下；您的代码中有错别字 D 一个vs见面 d 一个（小写）

let myTodos = {
    day:'monday',
    meetings: 0,
    meetdone: 0
}
let addMeetings = function(todo,meet=0) {
    todo.meetings = todo.meetings+meet;
}

let meetDone = function(todo,meet=0) {
    todo.meetdone = todo.meetdone-meet;
}
let restDay = function(todo) {
    todo.meetings=0;
    todo.meetDone=0;
}
let getSummaryOfDay = function(todo) {
    let meetleft = todo.meetings + todo.meetdone;
    console.log(meetleft);
}
addMeetings(myTodos,4);
addMeetings(myTodos,2);
meetDone(myTodos,5);
getSummaryOfDay(myTodos);

作为一种习惯，我也尝试以;结尾的行，这是一种更好的编写代码的方式:)希望对您有所帮助

如何对同一对象的2个属性执行算术加法

2 个答案: