Ty：创建页面，内容为“{{LSL Header|ml=*}}{{LSLC|Keywords}}{{LSLC|Flow Control}}{{LSLC|}} {{函数详情 |函数名 = Function: string llJsonGetValue( string json, list specifiers ); |…”

2020-08-20T12:02:52Z

创建页面，内容为“{{LSL Header|ml=*}}{{LSLC|Keywords}}{{LSLC|Flow Control}}{{LSLC|}} {{函数详情 |函数名 = Function: string llJsonGetValue( string json, list specifiers ); |…”

新页面

{{LSL Header|ml=*}}{{LSLC|Keywords}}{{LSLC|Flow Control}}{{LSLC|}}

{{函数详情
|函数名 = Function: string llJsonGetValue( string json, list specifiers );
|参数= 参数：
string json
list specifiers
|返回值= 返回值：返回一个通过解析 json 生成的字符串，这个字符串表示 json 并按说明符的指定进行遍历

|注意事项=Lljsongetvalue 要比从带有 lllist2string 的列表读取值慢得多。但是使用 lllist2string 时，需要解析字符串并将其转换为 list。当您需要解析字符串时，lljsongetvalue 要快得多: 例如，通过 lllist2string (llparsestring2list (yourstring，[ delimiters ] ，[ spacers ]) ，n) ; 当您需要集中地迭代时，考虑 lljson2list。

|示例=
示例一
<pre>
default {
state_entry() {

//below is an example of a JSON=string with a key called "key" and a value "val"
string json1 = "{\"key\":\"val\"}";
llSay(0, llJsonGetValue( json1, ["key"]));//returns "val" in localchat

string json2 = "{\"mansBestFriend\":\"dog\"}";
llSay(0, llJsonGetValue( json2, ["mansBestFriend"]));//returns "dog" in localchat
}
}
</pre>
示例二
<pre>
JGetValTest(){
string j="[[1,2],[4,5,6]]"; //JSON may be written directly as a string like this in sl.
string k; //this will change with each command below;
k=llJsonGetValue(j,[]); //returns the whole array of a JSON. It might just be one entry or a whole nested array or whole nested object.
//if "j" is a single JSON_STRING, this may return what the string represents as a JSON within a string; a JSON_NUMBER , JSON_TRUE, TRUE ...

k=llJsonGetValue("\"3.14\"",[]); //==k="3,14" (float that was stored in a JSON_STRING within a JSON. and not as JSON_NUMBER for no good reason)
k=llJsonGetValue("\"TRUE\"" ,[]); //==k="TRUE" (the value was stored as a JSON_STRING and is thus returned verbatim)
k=llJsonGetValue(j,[0]); //returns only the first entry (at offset 0). An entry can be any JSON type,
//each entry being separated by a comma from other entries.
//array and object entries may contain multiple comma separated entries within them.
k=llJsonGetValue(j,[1]);//returns only the second entry... (all the above still applies) k="[4,5,6]";
k=llJsonGetValue(llJsonGetValue(j,[1]),[2]);
//instead of getting an entry from "j" we get a sub-entry from llJsonGetValue(j,[1]),
//assuming the sub-entry is a JSON_ARRAY. It returns the 3rd sub-entry of the second entry,
//that is an array with 3 entries. it would make k="6".
//it will return JSON_INVALID if there is no 3rd entry in the 2nd sub-array,
//or no 2nd sub-array.
k=llJsonGetValue(j,[1,2]); //Shorter way to do the same as in the previous example.
k=llJsonGetValue("true",[]); //Sets k to JSON_TRUE
k=llJsonGetValue("True",[]); //Sets k to JSON_INVALID because the JSON constant for 'true' is all lower case
k=llJsonGetValue("TRUE",[]); //Sets k to JSON_INVALID because the JSON constant for 'true' is all lower case
k=llJsonGetValue(JSON_TRUE,[]); //Sets k to JSON_INVALID. The JSON_xxxx constants are not supposed to be part of
// a JSON string, just values to test against.
}
</pre>

|相关函数=
[[llList2Json]]
[[llJson2List]]
[[llJsonSetValue]]
[[llJsonValueType]]
|相关事件=无

}}

LlJsonGetValue - 版本历史

Ty：创建页面，内容为“{{LSL Header|ml=*}}{{LSLC|Keywords}}{{LSLC|Flow Control}}{{LSLC|}} {{函数详情 |函数名 = Function: string llJsonGetValue( string json, list specifiers ); |…”