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README
MIT

eval5

中文 | English

GitHub license npm npm bundle size

基于 TypeScript 编写的 JavaScript 解释器,支持完整 ES5 语法

支持浏览器、node.js、小程序等 JavaScript 运行环境

在线体验

更多示例

使用场景

  • 浏览器环境中需要使用沙盒环境执行 JavaScript 脚本
  • 控制执行时长
  • 不支持eval Function的 JavaScript 运行环境:如 微信小程序 demo we-script taro-script
  • 研究/学习用

支持 ECMAScript 版本

ES5

安装

npm install --save eval5

使用

Edit eval5

import { Interpreter } from "eval5";

const interpreter = new Interpreter(window, {
	timeout: 1000,
});

let result;

try {
	result = interpreter.evaluate("1+1");
	console.log(result);

	interpreter.evaluate("var a=100");
	interpreter.evaluate("var b=200");
	result = interpreter.evaluate("a+b");

	console.log(result);
} catch (e) {
	console.log(e);
}

参数

interface Options {
	// 默认为:0,不限制
	timeout?: number;
	// 根作用域,只读
	rootContext?: {} | null;
	globalContextInFunction?: any;
}

示例

import { Interpreter } from "eval5";

const ctx = {};
const interpreter = new Interpreter(ctx, {
    rootContext: window,
	timeout: 1000,
});

interpreter.evaluate(`
    a = 100;
    console.log(a); // 100
`);

window.a;//undefined

Interpreter

version

当前版本

global

默认值: {}

设置默认的全局作用域

Interpreter.global = window;
const interpreter = new Interpreter();
interpreter.evaluate('alert("hello eval5")');

globalContextInFunction

默认值: undefined

eval5 不支持 use strict 严格模式, 在非严格下的函数中this默认指向的是全局作用域,但在eval5中是undefined, 可通过globalContextInFunction来设置默认指向。

import { Interpreter } from "Interpreter";

const ctx = {};
const interpreter = new Interpreter(ctx);
interpreter.evaluate(`
this; // ctx
function func(){
    return this; // undefined
}
func();
`);
import { Interpreter } from "Interpreter";

Interpreter.globalContextInFunction = window;
const ctx = {};
const interpreter = new Interpreter({});
interpreter.evaluate(`
this; // ctx
function func(){
    return this; // window
}
func();
`);

原因,示例代码:

注意: alert异常

import { Interpreter } from "Interpreter";

Interpreter.globalContextInFunction = {};

const ctx = {alert: alert};

const interpreter = new Interpreter(ctx);

interpreter.evaluate(`
// throw Illegal invocation
alert('Hello eval5'); // 同 alert.call({}, 'Hello eval5')
`);

constructor(context = Interpreter.global, options?: Options )

构造函数

Interpreter 的实例方法

evaluate(code: string): any

执行给定的字符串代码,并返回最后一个表达式的值

import { Interpreter } from "Interpreter";

const interpreter = new Interpreter(window);

const result = interpreter.evaluate(`
var a = 100;
var b = 200;

a+b;

`);

console.log(result); // 300

appendCode(code: string): any

evaluate的别名

getExecutionTime(): number

获取上一次调用evaluate的执行时长

setExecTimeout(timeout: number = 0): void

设置执行时长

getOptions(): Readonly<Options>

获取解释器参数


evaluate(code: string, ctx?: {}, options?: Options)

执行给定的字符串代码,并返回最后一个表达式的值

注: 该函数每次执行都会创建一个新的解释器

import { evaluate } from "eval5";

evaluate(
	`
var a = 100;
var b = 100;
console.log(a+b);
`,
	{ console: console }
); // 200

evaluate(`
    a;
`); // a is not defined

Function

该函数会将Interpreter.global Interpreter.globalContextInFunction当作默认值并创建新的解释器

import { Function } from "eval5";

const func = new Function("a", "b", "return a+b;");
console.log(func(100, 200)); // 300

vm

查看 vm

  • vm.createContext
  • vm.compileFunction
  • vm.runInContext
  • vm.runInNewContext
  • vm.Script

License

MIT

相关

MIT License Copyright (c) 2019-2020 eval5 nobo Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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