Remove leading slash, if str starts with slash, it will be removed
删除斜杆前缀，如果字符串以斜杠开头，则将删除
removeLeadingSlash('/foo/bar') // => foo/bar Copy
removeLeadingSlash('/foo/bar') // => foo/bar
Remove leading slash, if str starts with slash, it will be removed
删除斜杆前缀，如果字符串以斜杠开头，则将删除