lesson2 can not install the gulp

[xkx9431]

when run the 'command: npm install --save-dev gulp' the warning message are as belows:

D:\xkx\gulp_learn>npm install --save-dev gulp
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN gulp_learn@1.0.0 No description
npm WARN gulp_learn@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: abbrev@1.1.1 (node_modules\fsevents\node_modules\abbrev):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\abbrev' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.abbrev.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: ansi-regex@2.1.1 (node_modules\fsevents\node_modules\ansi-regex):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\ansi-regex' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.ansi-regex.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: aproba@1.2.0 (node_modules\fsevents\node_modules\aproba):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\aproba' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.aproba.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: balanced-match@1.0.0 (node_modules\fsevents\node_modules\balanced-match):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\balanced-match' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.balanced-match.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: chownr@1.1.1 (node_modules\fsevents\node_modules\chownr):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\chownr' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.chownr.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: code-point-at@1.1.0 (node_modules\fsevents\node_modules\code-point-at):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\code-point-at' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.code-point-at.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: concat-map@0.0.1 (node_modules\fsevents\node_modules\concat-map):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\concat-map' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.concat-map.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: console-control-strings@1.1.0 (node_modules\fsevents\node_modules\console-control-strings):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules\console-control-strings' -> 'D:\xkx\gulp_learn\node_modules\fsevents\node_modules.console-control-strings.DELETE'