1. JavaScript入门

// 单行注释
print("Hello world!");


// 变量
var city = 'beijing';
var county = 'China';
var population = 2.19*10000000;

print(city);
print(county);
print(population);

//布尔类型
var T=true;
var F=false;
print(T);

// 列表
var majorCities = ['beijing','shanghai','nanjing'];
print(majorCities)

// 字典（对象）
var cityData = {'city':city,'population':population,'elevation':930};
print(cityData)

// 判断
var time=15;
if (time<10)
{
    print("早上好");
}
else if (time>=10 && time<20)
{
    print("今天好");
}
else
{
    print("晚上好!");
}

// 循环
var x = 0;
for (var i=0; i<5; i++)
{
      x=x  + i ;
      print(x);
}

// 函数
function greet(name){
  return 'Hello ' + name+'!';
}

print(greet('yunxingluoyun'));

结果：

Hello world!
beijing
China
21900000
true
["beijing","shanghai","nanjing"]
Object (3 properties)
city: beijing
elevation: 930
population: 21900000
今天好
0
1
3
6
10
Hello yunxingluoyun!