mocha-reporter-cov-summary 完成所有测试后打印覆盖率摘要。用法在 package.json ： \"scripts\": { \"test\": \"./node_modules/.bin/mocha --reporter node_modules/mocha-reporter-cov-summary test\" } 将打印为： Coverage Summary: 1094 lines of 1253 lines, 87.3% covered