Question

我能够遍历我的JSON对象值并找到我要寻找的字符串，但是我不确定修改后如何设置新值。我可能使用了错误的方法，但可以就如何使其工作以及应该使用哪种适当方法获得一些反馈。

this.specVars = {

  rgba_000000 : "rgba(0, 0, 0, 1)", //Black
  rgba_222222 : "rgba(34, 34, 34, 1)", //Dark gray
  rgba_2ba6cb : "rgba(43, 166, 203, 1)",
  rgba_336699 : "rgba(51, 102, 153, 1)", //Blue hyperlink
  rgba_ffffff : "rgba(255, 255, 255, 1)", //White

};

//测试使用的浏览器，并在使用Firefox时从颜色值中删除alpha（opacity）值

///将对象中的值转换为用于解析每个值的数组

var colors = this.specVars;

var values = Object.values(colors);

for (var value of values){

  if(value.includes(', 1)')){

    value = value.replace(', 1)', ')');

    value = value.replace('rgba', 'rgb');

    //How do i set the value in the actual object?? 

    console.log(value);

  };

}

Answer 1

您可以像这样在任何索引处简单地更改值

this.specVars['rgba_000000'] = 10;

以您的情况

this.specVars = {

  rgba_000000 : "rgba(0, 0, 0, 1)", //Black
  rgba_222222 : "rgba(34, 34, 34, 1)", //Dark gray
  rgba_2ba6cb : "rgba(43, 166, 203, 1)",
  rgba_336699 : "rgba(51, 102, 153, 1)", //Blue hyperlink
  rgba_ffffff : "rgba(255, 255, 255, 1)", //White

};

var colors = this.specVars;

var values = Object.values(colors);

for (var value of values){
    if(value.includes(', 34')){
      values[values.indexOf(value)] = 10;
  }
}


console.log(values);

或

var keys = Object.keys(colors);
var values = Object.values(colors);

for (var value of values){
    if(value.includes(', 34')){
      this.specVars[keys[values.indexOf(value)]] = 10;
  }
}

Answer 2

在keys数组上循环。例如：

var colors = this.specVars;

var keys = Object.keys(colors);

keys.forEach(key => {

  let value = colors[key];

  if(value.includes(', 1)')){

    value = value.replace(', 1)', ')');

    value = value.replace('rgba', 'rgb');

    colors[key] = value;

    console.log(value);
  };
});

Answer 3

尝试

---STARTING ATOMIC  #### Atomic context wrapping my serializer's create method
Executing query: 'SAVEPOINT `s139667621889792_x1`' - args: None

---STARTING ATOMIC  #### Atomic context wrapping my model's save method
Executing query: 'SAVEPOINT `s139667621889792_x2`' - args: None

---INSIDE MODEL SAVE
---LOCKING TABLES
Executing query: 'LOCK TABLES vertex WRITE, edge WRITE
---LOCKED TABLES

---STARTING ATOMIC  #### I think Django must wrap some queries in an atomic block, but this doesnt even create a savepoint
Executing query: 'INSERT INTO `edge`...
---EXITING ATOMIC

#### WHERE MY CYCLE CHECK CODE WOULD RUN - not implemented yet

---UNLOCKING TABLES
Executing query: 'UNLOCK TABLES' - args: None
---UNLOCKED TABLES

---EXITING ATOMIC
Executing query: 'RELEASE SAVEPOINT `s139667621889792_x2`' - args: None
Executing query: 'ROLLBACK TO SAVEPOINT `s139667621889792_x2`' - args: None   ### WHAT I BELIEVE TO BE THE OFFENDING QUERY

---EXITING ATOMIC
Executing query: 'ROLLBACK TO SAVEPOINT `s139667621889792_x1`' - args: None

Traceback (most recent call last):
  File ".../site-packages/django/db/backends/utils.py", line 83, in _execute
    return self.cursor.execute(sql)
  File ".../site-packages/django/db/backends/mysql/base.py", line 72, in execute
    return self.cursor.execute(query, args)
  File ".../site-packages/pymysql/cursors.py", line 170, in execute
    result = self._query(query)
  File ".../site-packages/pymysql/cursors.py", line 328, in _query
    conn.query(q)
  File ".../site-packages/pymysql/connections.py", line 516, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File ".../site-packages/pymysql/connections.py", line 727, in _read_query_result
    result.read()
  File ".../site-packages/pymysql/connections.py", line 1066, in read
    first_packet = self.connection._read_packet()
  File ".../site-packages/pymysql/connections.py", line 683, in _read_packet
    packet.check_error()
  File ".../site-packages/pymysql/protocol.py", line 220, in check_error
    err.raise_mysql_exception(self._data)
  File ".../site-packages/pymysql/err.py", line 109, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.InternalError: (1305, 'SAVEPOINT s139667621889792_x2 does not exist')

找到匹配项时，遍历JSON对象并更新值的正确方法是什么？

3 个答案: