text: //*
  let myName = 'Hi, My name is leah'; //这是一个字串
  let linkWord = 'my age is'
  let age = 12;
  console.log(myName, linkWord, age);
  
  let isFake = true;  // true false boolean 布林
  console.log(isFake);
  
  let bag = undefined;
  console.log(bag);
  
  let bag2 = null
  console.log(null)
  
  let title = '提示信息:';
  let title1 = 'success';
  let title2 = 'error';
  let alert1 = title + title1;
  let alert2 = title + title2;
  console.log(alert1);
  
  
  let sore = 100
  console.log(sore + 200)