ES8 padStart和padEnd

    {
            console.log("abc".padStart(10))
            console.log("abc".padStart(10, "foo"))
            console.log("abc".padStart(6, "123465"))
            console.log("abc".padStart(8, "0"))
            console.log("abc".padStart(1))

            console.log("---------------")
            console.log("abc".padEnd(10))
            console.log("abc".padEnd(10, "foo"))
            console.log("abc".padEnd(6, "123465"))
            console.log("abc".padEnd(1))

        }