Can't run npm run build:dll

[h2n07]

i can't run npm run build:dl
npm ERR! missing script: build:dll
my package.json file
{ "name": "OnlineJudgeDeploy", "version": "1.0.0", "description": "[简体中文](https://github.com/QingdaoU/OnlineJudgeDeploy/blob/2.0/README.md) | English", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "repository": { "type": "git", "url": "git+https://github.com/QingdaoU/OnlineJudgeDeploy.git" }, "keywords": [], "author": "", "license": "ISC", "bugs": { "url": "https://github.com/QingdaoU/OnlineJudgeDeploy/issues" }, "homepage": "https://github.com/QingdaoU/OnlineJudgeDeploy#readme", "dependencies": {}, "devDependencies": {} }