标签：导致 modules blank fun optional tar oop html class
gulpfile.js
gulp.task(‘watch‘, function () { gulp.watch(‘./css/*.css‘,[‘css‘]); gulp.watch(‘./html/*.html‘,[‘html‘]); gulp.watch(‘./image/*.*‘,[‘image‘]); gulp.watch(‘./js/*.cjs‘,[‘js‘]); });
报错：
[14:18:45] Error: watching css/*.css: watch task has to be a function (optionally generated by using gulp.parallel or gulp.series) at Gulp.watch (/Users/mac/Desktop/my_project/node_modules/gulp/index.js:31:11) at /Users/mac/Desktop/my_project/gulpfile.js:48:10 at taskWrapper (/Users/mac/Desktop/my_project/node_modules/undertaker/lib/set-task.js:13:15) at bound (domain.js:425:14) at runBound (domain.js:438:12) at asyncRunner (/Users/mac/Desktop/my_project/node_modules/async-done/index.js:55:18) at processTicksAndRejections (internal/process/task_queues.js:79:9)
分析：
这个是由于require引入的包的版本问题导致的。在不同的版本里，接口参数发生了变化。在gulp4.0之后已经只能接受watch第二个参数必须为函数。详情请看官网
方法一：
改版本<4.0
方法二：
gulp.task(‘watch‘, function () { gulp.watch(‘./css/*.css‘,gulp.series([‘css‘]));这个列表只会匹配第一个 gulp.watch(‘./html/*.html‘,gulp.series([‘html‘])); gulp.watch(‘./image/*.*‘,gulp.series([‘image‘])]); gulp.watch(‘./js/*.cjs‘,gulp.series([‘js‘])); });
gulp.task(‘watch‘, function () { gulp.watch(‘./css/*.css‘,gulp.parallel([‘css‘]));这个列表可以 支持多个元素 gulp.watch(‘./html/*.html‘,gulp.parallel([‘html‘])); gulp.watch(‘./image/*.*‘,gulp.parallel([‘image‘])]); gulp.watch(‘./js/*.cjs‘,gulp.parallel([‘js‘])); });
gulp 3.0 & 4.0 | watch task has to be a function问题
标签：导致 modules blank fun optional tar oop html class
原文地址：https://www.cnblogs.com/shenZS/p/13376624.html
