第一個javescript 程式

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<!DOCTYPE html><html><body><script language="javascript" type="text/javascript"><!--function greeter(person) {    return "Hello, " + person;}var user = "Jane User";document.body.innerHTML = greeter(user);confirm("ready to play");var age=prompt("what‘s your age"); if(age>=13) {     console.log("play"); } else {     console.log(‘sorry‘); }  console.log("You are at a Justin Bieber concert, and you hear this lyric ‘Lace my shoes off, start racing.‘" ); console.log("Suddenly, Bieber stops and says, ‘Who wants to race me?‘");  var userAnswer=prompt("Do you want to race Bieber on stage?");   if(userAnswer=‘yes‘) {     console.log("You and Bieber start racing. It‘s neck and neck! You win by a shoelace!"); }else{     console.log("Oh no! Bieber shakes his head and sings ‘I set a pace, so I can race without pacing.‘"); }  var feedback= prompt("Message"); if(feedback>8) {     console.log("Thank you! We should race at the next concert!");      } else {     console.log("I‘ll keep practicing coding and racing.") }//--></script></body></html> 

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第一個javescript 程式