How to implement pop-up window in javascript

Method: 1. Use alert() to implement the warning box window, the syntax "alert("text");"; 2. Use confirm() to implement the confirmation box window, the syntax "confirm("text")" ;3. Use prompt() to implement the prompt box, the syntax is "prompt("text","default value")".

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

Method 1: Use alert() to implement the warning box window

Alert boxes are often used to ensure that users can get certain information.

When the warning box appears, the user needs to click the OK button to continue the operation.

Syntax

window.alert("sometext");

The window.alert() method can be used directly without the window object. The alert() method can be used directly.

Example:

alert("你好，我是一个警告框！");

Method 2: Use the confirm() function to implement the confirmation box window

Confirmation boxes are usually used to verify whether user operations are accepted.

When the confirmation card pops up, the user can click "Confirm" or "Cancel" to confirm the user operation.

When you click "Confirm", the confirmation box returns true. If you click "Cancel", the confirmation box returns false.

Syntax

window.confirm("sometext");

The window.confirm() method can be used directly without the window object, using the confirm() method.

Example:

<p>点击按钮，显示确认框。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction(){
	var x;
	var r=confirm("按下按钮!");
	if (r==true){
		x="你按下了\"确定\"按钮!";
	}
	else{
		x="你按下了\"取消\"按钮!";
	}
	document.getElementById("demo").innerHTML=x;
}
</script>

Rendering:

##Method 3: Use the prompt() function to implement the prompt box window

The prompt box is often used to prompt the user to enter something before entering the page. value.

When the prompt box appears, the user needs to enter a certain value and then click the confirm or cancel button to continue the operation.

If the user clicks to confirm, the return value is the entered value. If the user clicks Cancel, the return value is null.

Syntax

window.prompt("sometext","defaultvalue");

The window.prompt() method can be used directly without the window object. The prompt() method can be used directly.

Example:

<p>点击按钮查看输入的对话框。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction(){
	var x;
	var person=prompt("请输入你的名字","Harry Potter");
	if (person!=null && person!=""){
	    x="你好 " + person + "! 今天感觉如何?";
	    document.getElementById("demo").innerHTML=x;
	}
}
</script>

Rendering:

##【Recommended Study:

javascript advanced tutorial

】

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