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How to enter data in javascript

青灯夜游
青灯夜游Original
2021-07-16 15:54:2417696browse

How to input data in javascript: 1. Use the prompt() method, which will pop up a dialog box that allows input values. It provides two buttons, OK and Cancel, and also provides the expected input value; 2. Use comfirm () method, pops up a confirmation message dialog box, and can get the true or false value.

How to enter data in javascript

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript input statement

JS provides two input methods prompt() and confirm(), let’s learn about them next;

1. prompt() method

Pops up a dialog box that allows you to enter a value, with two buttons to confirm and cancel, and allows you to set the default value

Syntax format: 

prompt(msg,defaultText)

  • msg: the text information to be displayed;

  • defaultText: the default value of the input box;

Example: 

 <script>
       function inBtn(){
           var msg = prompt("请输入值","预期输入");
           alert("你输入的值：" + msg);
       }
    </script>
    <button οnclick="inBtn()">打开输入框</button>

How to enter data in javascript

2. confirm() method

pops up a confirmation message dialog box with two buttons: OK and Cancel. Click OK to return true, and click Cancel to return false.

A dialog box pops up, showing the edited content, with two buttons: OK and Cancel. Click OK to return true, click Cancel to return false;

Syntax format:

confirm(message);  //message为想要显示的内容

Example: 

<body>
    <script>
       function inBtn(){
           var msg = confirm("你学过Javascript吗？");
           if(msg){
               alert("学过了，那还需要努力!");
               var msg2 = confirm("我将提供一个教程给你，需要吗？");
               if(msg2) 
                    alert("w3cschool");
               else 
                    alert("那可真是太遗憾了");
           }else{
               alert("没学过，那就开始学吧！");
           }
       }
    </script>
    <button οnclick="inBtn()">打开输入框</button>
</body>

The animation demonstration effect is as follows:

How to enter data in javascript

##[Recommended learning:

javascript advanced tutorial]

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