Head First JavaScript 第七章：7 类型相等转换等系统地讨论类型

Posted 2020-11-24 JasonPeng1

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2019-12-06

09:27:16

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>My Playlist</title>
  <script>
      /*function addSongs(){
          var song1 = document.getElementById("song1");
          var song2 = document.getElementById("song2");
          var song3 = document.getElementById("song3");
          song1.innerHTML = "Blue Suede Strings,by Elvis Pagely";
          song2.innerHTML = "Great Objects on Fire";
          song3.innerHTML = "儿子";
      }
      window.onload = addSongs;*/
function lieDetectorTest(){
    var lies = 0;
    var stolenDiamond = { };
    if(stolenDiamond){
        console.log("You stole the diamond");
        lies++;
    }
    var car ={
        keysInPocket:null
    };
    if(car.keysInPocket){
        console.log("Un oh,guess you stole the car!");
        lies++;
    }
    if(car.emptyGasTank){
        console.log("You drove the car after you stole it");
        lies++;
    }
    var foundYouAtTheCrimeScene = [ ];
    if(foundYouAtTheCrimeScene){
        console.log("A sure sign of guilt");
        lies++;
    }
    if(foundYouAtTheCrimeScene[0]){
        console.log("Caught with a stolen item");
    }
    var yourName = " ";
    if(yourName){
        console.log("Guess you lied about your name");
        lies++;
    }
    return lies;
}
var numberOfLies = lieDetectorTest();
console.log("You told" + numberOfLies + "lies");
if(numberOfLies>=3){
    console.log("Guilty as charged");
}
  </script>
  </head>
  <body>
      <h1>My awesome playlist</h1>
      <ul id = "playlist">
          <li id = "song1"></li>
          <li id="song2"></li>
          <li id = "song3"></li>
      </ul>
      
  </body>
</html>

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