fscript 是 AWTK 内置的脚本引擎,开发者可以在 UI XML 文件中直接嵌入 fscript 脚本,提高开发效率。本文介绍一下 fscript 中的 ** JSON 扩展函数 **
1.json_load
加载 json 数据。
原型
js
json_load(str) => object
json_load(binary) => object
json_load(data, size) => object
示例
js
var a = json_load('{"name": "fscript", "age": 100}');
2.json_save
将对象保存为 json 数据。
原型
js
json_save(obj) => binary
示例
js
var a = json_load('{"name": "fscript", "age": 100}');
json_save(a);
3.json_save_to_string
将对象保存为字符串数据。
原型
js
json_save_to_string(obj) => string
示例
js
var a = json_load('{"name": "fscript", "age": 100}');
print(json_save_to_string(a));
4.ubjson_load
加载 ubjson 数据。
原型
js
ubjson_load(binary) => object
ubjson_load(data, size) => object
示例
js
var a = ubjson_load(file_read_binary("test.ubjson"));
5.ubjson_save
将对象保存为 ubjson 数据。
原型
js
ubjson_save(obj) => binary
示例
js
var a = json_load('{"name": "fscript", "age": 100}');
var b = ubjson_save(a);
完整示例
js
//load from string
var str='{
"results": [
{
"location": {
"id": "WS0E9D8WN298",
"name": "GuangZhou"
},
"now": {
"code": "9",
"temperature": "30"
},
"last_update": "2022-04-28T14:50:00+08:00"
}
],
"name": "fscript",
"age": 100
}'
var a = json_load(str)
assert(object_get(a, "results.[0].location.id")=="WS0E9D8WN298");
assert(object_get(a, "results.[0].location.name")=="GuangZhou");
assert(object_get(a, "results.[0].now.code")=="9");
assert(object_get(a, "results.[0].now.temperature")=="30");
assert(object_get(a, "results.[0].last_update")=="2022-04-28T14:50:00+08:00");
assert(object_get(a, "name")=="fscript");
assert(object_get(a, "age")==100);
// 获取数组类型节点的子元素个数
assert(object_get(a, "results.#size")==1);
//save to file
var b=json_save(a)
assert(file_write("test.json", b))
//json obj to string
var c=json_save_to_string(a)
print(c)
//load from file as text
a = json_load(file_read_text("test.json"))
assert(object_get(a, "name")=="fscript");
assert(object_get(a, "age")==100);
//load from file as binary
a = json_load(file_read_binary("test.json"))
assert(file_remove("test.json"))
assert(object_get(a, "name")=="fscript");
assert(object_get(a, "age")==100);
assert(file_remove("test.json"))
unset(a)
unset(b)
unset(c)
unset(str)