script.runInThisContext([options])

• options <Object>

  • displayErrors <boolean> 当为 true 时，如果编译 code 时出现 Error，则导致错误的代码行会附加到堆栈跟踪中。 默认值: true。

  • timeout <integer> 指定终止执行前执行 code 的毫秒数。 如果执行终止，则将抛出 Error。 此值必须是严格的正整数。

  • breakOnSigint <boolean>

    如果执行终止，则将抛出 Error。 默认值: false。

• 返回: <any> 脚本中执行的最后一条语句的结果。

在当前 global 对象的上下文中运行 vm.Script 包含的编译代码。 运行代码无权访问本地作用域，但确实有访问当前 global 对象的权限。

下面的示例编译了增加 global 变量的代码，然后多次执行该代码：

const vm = require('vm');

global.globalVar = 0;

const script = new vm.Script('globalVar += 1', { filename: 'myfile.vm' });

for (let i = 0; i < 1000; ++i) {
  script.runInThisContext();
}

console.log(globalVar);

// 1000

• options <Object>
  • displayErrors <boolean> When true, if an Error occurs while compiling the code, the line of code causing the error is attached to the stack trace. Default: true.
  • timeout <integer> Specifies the number of milliseconds to execute code before terminating execution. If execution is terminated, an Error will be thrown. This value must be a strictly positive integer.
  • breakOnSigint <boolean> If true, the execution will be terminated when SIGINT (Ctrl+C) is received. Existing handlers for the event that have been attached via process.on('SIGINT') will be disabled during script execution, but will continue to work after that. If execution is terminated, an Error will be thrown. Default: false.
• Returns: <any> the result of the very last statement executed in the script.

Runs the compiled code contained by the vm.Script within the context of the current global object. Running code does not have access to local scope, but does have access to the current global object.

The following example compiles code that increments a global variable then executes that code multiple times:

const vm = require('vm');

global.globalVar = 0;

const script = new vm.Script('globalVar += 1', { filename: 'myfile.vm' });

for (let i = 0; i < 1000; ++i) {
  script.runInThisContext();
}

console.log(globalVar);

// 1000