When I put the code into a JS interpreter it shows an error, as shown below:
var win = window.open('about:blank')
^
ReferenceError: window is not defined
at Object.<anonymous> (/tmp/judge/main.js:1:11)
at Module._compile (internal/modules/cjs/loader.js:999:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
at Module.load (internal/modules/cjs/loader.js:863:32)
at Function.Module._load (internal/modules/cjs/loader.js:708:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js: