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JS click cycle to switch to play pictures

php中世界最好的语言
php中世界最好的语言Original
2018-04-18 14:53:293478browse

This time I will bring you JS click to cycle to switch to play pictures , what are the precautions for JS to click to cycle to switch to play pictures, the following is a practical case, let's take a look take a look. 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>单击循环切换图片</title>
<script>
var i = 1;
function nextImg(){
i++;
//步骤2：获取页面元素
var next = document.getElementById("nImg");
//步骤3：更改元素的src属性
next.src = "img/"+i+".jpg";
if(i==3){
i=0;
} 
}
</script>
</head>
<body>
<p>
<!--步骤1：绑定onclick事件-->
<button onclick="nextImg()">下一张</button>
<br />
<!--需自己准备3张图片-->
<img src="img/1.jpg" id="nImg" width="600px" height="400px" />
</p>
</body>
</html>

                                                                                                                                        

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