//dotnet add package Jint --prerelease

using Jint;

using System;

var e=new Engine();

Console.WriteLine("直接计算表达式：（1+2）*3");

var r1= e.Evaluate("(1+2)*3");

Console.WriteLine(r1);

Console.WriteLine("-----------------------");

Console.WriteLine("字符串操作：'abc'.length");

var r2=e.Evaluate("'abc'.length");

Console.WriteLine(r2);

Console.WriteLine("-----------------------");

Console.WriteLine("字符串操作：'abc'.substr(2)");

var r3=e.Evaluate("'abc'.substr(2)");

Console.WriteLine(r3);

Console.WriteLine("-----------------------");

Console.WriteLine("使用SetValue赋值给JS变量");

var e2 = new Engine()

.SetValue("x", 1)

.SetValue("y",2);

var r4=e2.Evaluate("x+y");

Console.WriteLine(r4);

Console.WriteLine("-----------------------");

Console.WriteLine("不能通过值变量传递数据");

var val=3;

var e3 = new Engine()

.SetValue("v",val)

.Execute("v=5");

Console.WriteLine(e3.Evaluate("v"));

Console.WriteLine(val);

Console.WriteLine("-----------------------");

Console.WriteLine("可以使用对象进行数据交换：张三变李四");

var myobj= new Student {

Name="张三"

};

Console.WriteLine(myobj.Name);

var e4 = new Engine()

.SetValue("student", myobj)

.Execute("student.Name = '李四'");

Console.WriteLine(myobj.Name);

Console.WriteLine("-----------------------");

Console.Write("将CSharp函数设置给Js引擎");

var engine = new Engine()

.SetValue("log", new Action<object>(Console.WriteLine));

engine.Execute(@"

function hello() {

log('Hello World');

};

hello();

");

Console.WriteLine("-----------------------");

Console.WriteLine("调用JS函数计算BMI");

var e5=new Engine()

.Execute("function bmi(weight, height) { return weight/height/height; }");

Console.WriteLine(e5.Invoke("bmi",75,1.75));

Console.WriteLine("-----------------------");

Console.WriteLine("调用.Net函数写入文件");

var e6 = new Engine(cfg => cfg.AllowClr());

e6.Execute(@"var f=System.IO.StreamWriter('sayhello.log');

f.WriteLine('你好 !');

f.Dispose();");

//Console.WriteLine("-----------------------");

//Console.WriteLine("创建CSharp类");

//var e7= new Engine(cfg => cfg.AllowClr());

//e7.SetValue("Student", Jint.Runtime.Interop.TypedReference.CreateTypedReference(e7, typeof(Student)));

//e7.Execute(@"var s=new Student();

// s.Name='张三';");

//var s=e7.GetValue("s") as Student;

//Console.WriteLine(s.Name);