Implementation code of JS message pop-up alert, confirm, and prompt

alert message prompt box:

For warning, only OK button.

alert(str);

confirm message dialog:

The return value can be used to determine what button the user clicked 。

confirm(str);

Returns true when the user clicks the OK button.
Returns false when the user clicks the "Cancel" button.

prompt() message input box:

The pop-up box contains an input box and a confirmation cancel button, and the user can enter content in the input box.

var reason = (“Please enter a reason for failure to pass the review：”, “”);

//1. Simply determine whether the user fills in the "Reason for Failure to Pass the Review":if(reason){ 
//The user filled in the reason}else{ 
//The user has no reason to fill in}

//2. To distinguish whether the user clicks "OK" or "Cancel" without typing:if(reason){ 
alert(reason);//Show input content//The user has filled in the content and clicked "OK"}else if(reason === “”){ 
//The user did not enter the content and clicked "OK"}else{ 
//Click "Cancel"}

Supplement: 3 basic pop-up boxes of js

3 basic pop-up boxes of js:
1. Prompt box (warning box): alert("content");
There is a confirm button on the pop-up box, no return value
Example: alert("Box content!")

2. Confirm box: confirm("prompt content");
There are 2 buttons in the pop-up box: OK/Cancel
Click OK to return true, click Cancel to return false
Example 1: confirm("Prompt Content")
Example 2: <a href="" οnclick="return confirm('Do you want to visit Taobao?')">Go to Taobao</a>

3. Input box: prompt(parameter);
Parameter 1: Prompt statement. Default silent
Parameter 2: Default value. Different browsers have different default values.
Return value type is string
Input box example:

<script>
    // var str = prompt();
    var str = prompt("Please enter your name", "");
    ("You entered:" + str);
</script>

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