第一章 1.2.3 ng new 创建项目名称只能包含字母,数字和破折号(而不能为下划线)

[ChasLui]

Project name "angular2_hello_world" is not valid. New project names must start with a letter, and must contain only alphanumeric characters or dashes. When adding a dash the segment after the dash must also start with a letter.
angular2_hello_world