js 幾種打印輸出

• 彈窗輸出: alert("hello world!")
• 控制台輸出: console.log("hello world!")
• 直接輸出: document.write("hello world!")
• 輸出到html元素: document.getElementById("demoid").innerHTML = "hello world!"
  document.getElementById("demoid").innerText = "hello world! innerText"