If an attribute in a JSON object contains double quotation marks and is converted to a string, a backslash is automatically added. For details, see article 1. If an attribute in a JSON object contains double quotation marks, for example
The Code is as follows:
{
"Description": "25 ""
}
If it is converted to a string, a backslash is automatically added to the string format to "25 \", and then passed to the rest api and saved to MongoDB.
If you use the MongoDB shell to display the data, the value is "25 \", correct.
2. however, if the value is read using C ++ driver, "25" is obtained. Therefore, if you directly return the value to the browser, use jQuery. if parseJSON () is used for parsing, an error is returned.
When the C ++ segment is serialized into a string, you need to judge and replace "\".
The Code is as follows:
Void string_to_json_string (std: string const & str, std: string & json_str ){
Std: stringstream ss;
For (size_t I = 0; I <str. length (); ++ I ){
If (str [I] = '"'){
Ss <'\' <'\"';
} Else {
Ss <str [I];
}
}
Json_str = ss. str ();
}
3. if JavaScript calls jQuery for "25. after parseJSON (), the backslash disappears and becomes "25 "". if you call jQuery again for this attribute value. if pareseJSON is used, an error occurs again.
JavaScript code must be written to prevent errors:
The Code is as follows:
RemoveDoubleQuotes: function (str ){
Return str. replace ("\"","\\\"");
},
This is the cycle of double quotation marks in JSON. Please be careful.
