环境安装

安装

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$ brew tap dart-lang/dart
$ brew install dart

验证

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$ dart --version

版本命名

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# 升级
$ brew upgrade dart

# 版本切换
$ brew switch dart 1.24.3
$ brew switch dart 2.1.0

# 查看版本
$ brew info dart

stagehand

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# 自动创建dart工程
$ pub global activate stagehand
$ export PATH="$PATH":"$HOME/.pub-cache/bin" 

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# 会在当前目录，快速生成代码
$ cd dart-demo 
$ stagehand 
Stagehand will generate the given application type into the current directory.

usage: stagehand <generator-name>
    --[no-]analytics    Opt out of anonymous usage and crash reporting.
-h, --help              Help!
    --version           Display the version for stagehand.
    --author            The author name to use for file headers.
                        (defaults to "<your name>")

console-full   - A command-line application sample.
console-simple - A simple command-line application.
package-simple - A starting point for Dart libraries or applications.
server-shelf   - A web server built using the shelf package.
web-angular    - A web app with material design components.
web-simple     - A web app that uses only core Dart libraries.
web-stagexl    - A starting point for 2D animation and games.

zip sdk包

sdk下载

语法 – 学习时候，请类比js or ts

coding注意事项

• main函数不可缺
• 需要；结尾

类型

• 7种内置类型：strings,booleans,maps,lists,numbers,runes(字符)，symbols（符号类型）

  |dart | js | ts

——-|——–|——
strings| string | string
booleans| boolean | boolean
maps| map or set | map or set
lists | array or []| array or []
symbols | symbol | symbol
runes | string | string
numbers | Number | number
无对象 | object | object
自定义 | function | function
无 | 无 | void
null | null | null
无 | undefined | undefined
=> | => | => 支持箭头函数

• var 变量自动推断，支持显示声明7种类型。

• var 变量，不赋值，则为null。非js种的undefined

• numbers分，int,double类型。

• 变量可以直接操作方法。类似js。

  

• 参数、返回值是定义不同于ts

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  //dart ,类似java\c int fibonacci(int n) { if (n == 0 || n == 1) return n; return fibonacci(n - 1) + fibonacci(n - 2); } //ts function getLength(something: string | number): number { return something.length; }

• 引用包，只能使用import。js| ts，可以使用module.exports| require.

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  // Importing core libraries import 'dart:math'; // Importing libraries from external packages import 'package:test/test.dart'; // Importing files import 'path/to/my_other_file.dart';

  number

• int

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  var num = 1; print(num.runtimeType); print(num.isEven); print(num.bitLength);

• strings

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  # 类似python ，原始字符串 var ss = r'hello \n world'; print(ss); print(ss * 2); //copy