查看“LlJsonGetValue”的源代码

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{{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

}}