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 const arr = this.arr.filter((a) => {
                        return a.name.indexOf(this.findValue) === -1? null : a
                    })

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 const arr = this.arr.filter((a) => {
                        return a.name.indexOf(this.findValue) !== -1
                    })

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  if (this.key === 0) {
                        console.log('00000000')
                        arr.sort(function(a, b) {
                            return a.number - b.number
                        })
                    } else if (this.key === 1) {
                        arr.sort(function(a, b) {
                            return b.number - a.number
                        })
                    } else if (this.key === 2) {
                        arr = this.arr
                    }
 return arr

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if (this.key) {
                        arr.sort((a, b) => {
                            return this.key === 1 ? a.number - b.number : b.number - a.number
                        })
                    }
 return arr

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const arr = [1, 2, 3, 4, 5, 6]
const res = arr.filter(function(item) {
    if (item % 2 === 0) {
        return true
    } else {
        return false
    }
})

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const arr = [1, 2, 3, 4, 5, 6]
const res = arr.filter(item => item % 2 === 0)

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function connect(options) {
    let host = options.host;
    let username = options.username;
    let password = options.password;
    let port = options.port;
}
connect({
    host: 'xx.com',
    username: 'root',
    password: 'root',
    port: 3306
})

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function connect({ host, username, password, port = 8080 }) {
    console.log(port)
}
connect({
    host: 'xx.com',
    username: 'root',
    password: 'root',
    // port: 3306
})

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handleCheck(id){
       this.todos.forEach(element => {
         if( element.id === id ){
           element.status=!element.status
         }
       });
     }

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this.todos.forEach(element => {
         if( element.id === id )element.status=!element.status
       });