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Go 发布时间：2019-10-06 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了golang-otto JS解释器，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

otto是一个Go语言实现的JavaScript 解释器

otto是一个Go语言实现的JavaScript的语法分析器和解释器

 
        import 
        ( 
       
        "github.com/robertkrimen/otto" 
       
        )

在虚拟机中运行一些代码

@H_874_49@ 4

5

 
        vm := otto.New() 
       
        vm.Run(` 
       
        abc = 
        2 
        + 
        ; 
       
        console.log( 
        "The value of abc is " 
         + abc); 
        // 4 
       
        `)

从虚拟机中获取一些值

value,err := vm.Get( "abc" )

 
        :rgb(199,_ := value.ToInteger() 
       

}

设置一个数字变量

vm.Set( "def" , 11 )

 
        "The value of def is " 
         + def);

 
        // The value of def is 11

 设置一个字符串变量

        4 
      
     "xyzzy" 
        "Nothing happens." 
        console.log(xyzzy.length); 
        // 16 
       
 活动一个语句的运行结果
 
 :1em 0px!important; position:relative!important; overflow-y:hidden!important; overflow-x:auto!important; font-size:12px!important; font-family:Consolas,_ = vm.Run( 
        "xyzzy.length" 
        { 
       
        // value is an int64 with a value of 16 
       
        :rgb(199,_ := value.ToInteger() 
       
 一个错误发生时

        5 
      
        6 
      
     :1.1em!important; margin:0px!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; font-family:Consolas,err = vm.Run( 
        "abcdefghijlmnopqrstuvwxyz.length" 
        ) 
       
        @H_586_197@if 
        err != nil { 
       
        // err = ReferenceError: abcdefghijlmnopqrstuvwxyz is not defined 
       
        // If there is an error,then value.IsUndefined() is true 
       
        ... 
       
 设置你个函数
 
 "sayHello" 
        { 
       
        fmt.Printf( 
        "Hello,%s.\n" 
        l.Argument( 
        0 
        ). 
        @H_586_197@String 
        ()) 
       
        @H_586_197@return 
        otto.Value{} 
       
        }) 
       
 设置你个带有返回值的函数
"twoPlus" 
        right,_ := call.Argument( 
        ).ToInteger() 
       
        result,_ := vm.ToValue( 
        + right) 
       
        result 
       
 在JavaScript中使用函数
 
 :1em 0px!important; position:relative!important; overflow-y:hidden!important; overflow-x:auto!important; font-size:12px!important; font-family:Consolas,_ = vm.Run(` 
       
        sayHello( 
        "Xyzzy" 
        ); 
        // Hello,Xyzzy. 
       
        sayHello(); 
        
        result = twoPlus( 
        2.0 
        // 4 
       
        `) 
       
 Parser 如果你只是对AST（抽象语法树）感兴趣，你可以获得一个分离的语法解析器
 http://godoc.org/github.com/robertkrimen/otto/parser
 解析并返回一个AST

        6 
      
        7 
      
        8 
      
        9 
      
        10 
      
        11 
      
        12 
      
        13 
      
        14 
      
        15 
      
        16 
      
      @H_616_349@
        17 
      
     filename :=""// A filename is optional
 
        src := ` 
       
        // Sample xyzzy example 
       
        ( 
        function 
        (){ 
       
        ( 
        3.14159 
        > 
        ) { 
       
        :rgb(199,World." 
        ); 
       
        ; 
       
        } 
       
        var 
        xyzzy = 
        @H_586_197@NaN 
        ; 
       
        ); 
       
        xyzzy; 
       
        })(); 
       
        ` 
       
        // Parse some JavaScript,yielding a *ast.Program and/or an ErrorList 
       
        program,err := parser.ParseFile(nil,filename,src,monospace!important; font-size:12px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.1em!important; margin:0px!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:inherit!important; BACkground:none!important">)

otto

你也在命令行中运行otto

@H_118_450@ 2

$ go @H_586_197@get -v github.com/robertkrimen/otto/otto

golang-otto JS解释器

Parser

otto

使用

函数调用类型

函数调用的参数

对象类型

func (Object) Call

func (Object) Class

func (Object) Get

func (Object) Keys

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