小编dap*_*mao的帖子

我使用Elasticsearch 5.2,并不能看到index creation time用http://localhost:9200/_cat/indices?v.

只是想知道index creation time每个指数会显示哪些选项.

我有一个像

{
    "_id" : ObjectId("5738cb363bb56eb8f76c2ba8"),
    "records" : [
        {
            "Name" : "Joe",
            "Salary" : 70000,
            "Department" : "IT"
        }
    ]
},
{
    "_id" : ObjectId("5738cb363bb56eb8f76c2ba9"),
    "records" : [
        {
            "Name" : "Henry",
            "Salary" : 80000,
            "Department" : "Sales"
        },
        {
            "Name" : "Jake",
            "Salary" : 40000,
            "Department" : "Sales"
        }
    ]
},
{
    "_id" : ObjectId("5738cb363bb56eb8f76c2baa"),
    "records" : [
        {
            "Name" : "Sam",
            "Salary" : 90000,
            "Department" : "IT"
        },
        {
            "Name" : "Tom",
            "Salary" : 50000,
            "Department" : "Sales" …

只是使用两种简单的方法来迭代Go中的字符串.第一种似乎是正确的,但第二种方式是从-97开始的减号.有人知道为什么吗？

func main() {
    str := "abc"

    for i := 0; i < len(str) ; i++ {
        println(str[i] - 'a')
    }

    for x := range str {
        println(x - 'a')
    }
}

结果是 -

0
1
2
-97
-96
-95