Question (prompt message dialog box)

From , 5 Years ago, written in JavaScript, viewed 166 times.

prompt弹出消息对话框,通常用于询问一些需要与用户交互的信息。弹出消息对话框（包含一个确定按钮、取消按钮与一个文本输入框）。
 
语法:
 
prompt(str1, str2);
参数说明：
 
str1: 要显示在消息对话框中的文本，不可修改
str2：文本框中的内容，可以修改
返回值:
 
1. 点击确定按钮，文本框中的内容将作为函数返回值
2. 点击取消按钮，将返回null
看看下面代码:
 
var myname=prompt("请输入你的姓名:");
if(myname!=null)
  {   alert("你好"+myname); }
else
  {  alert("你好 my friend.");  }
 
 
 
 
注:在用户点击对话框的按钮前，不能进行任何其它操作。

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Question (prompt message dialog box)

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