异常截图
解决方案：
https://stackoverflow.com/questions/36897877/gulp-error-the-following-tasks-did-not-complete-did-you-forget-to-signal-async
https://blog.csdn.net/qq_41208114/article/details/79109269
// 必须返回一个steam对象 return gulp.src(‘package.json‘); // 或者返回一个promise对象 return new Promise((resolve, reject) => { console.log(‘Success‘); // Success resolve(‘success‘) })
gulp#4.0 Did you forget to signal async completion?
原文：https://www.cnblogs.com/CyLee/p/9229679.html