1. 方法1

func del(data []int, d int) []int {
    i := 0
    for _, v := range data {
        if v != d {
            data[i] = v
            i++
        }
    }
    return data[:i]
}

2. 方法2

func del2(data []int, d int) []int {
    for i := 0; i < len(data); i++ {
        if data[i] == d {
            data = append(data[0:i], data[i+1:len(data)]...)
            i--
        }
    }	
    return data
}