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📜  javascript代码示例中提示的含义是什么

📅  最后修改于: 2022-03-11 15:01:42.855000             🧑  作者: Mango

代码示例2
var person = prompt("Please enter your name", "Harry Potter");

if (person != null) {
  document.getElementById("demo").innerHTML =
  "Hello " + person + "! How are you today?";
}