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Detailed explanation of JavaScript implementation of progress bar loading effect tutorial

巴扎黑Original: 2017-08-18 10:53:441369browse

This article mainly introduces in detail how to simply implement the js progress bar loading effect. It has a certain reference value. Interested friends can refer to it.

The examples in this article share the js progress with everyone. The specific code for the loading effect is for your reference. The specific content is as follows

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>下载进度</title>
<style>
/*定义父容器*/
.content{
width: 500px;
height: 200px;
background: pink;
margin:0 auto;
}
/*定义进度条*/
.box{
width: 20px;
height: 30px;
line-height: 30px;
text-align: center;
background: #f00;
color: #fff;
}
/*定义下方显示的下载百分比*/
.percent{
width: 100%;
height: 30px;
line-height: 30px;
color: #00f;
text-align: center;
}
</style>
</head>
<body>
<p class="content" id="content">
<input type="button" id="button" value="暂停/增加" onclick="parse()">
<p class="box" id="box"></p>
<p class="percent" id="percent"></p>
</p>
<script>
// 获取id为box的元素
var box = document.getElementById("box");
//初始化y，此值只可以放在方法外部，若放到方法内部的话，那方法的每一次执行都是从宽度为0开始，从而使得进度条会一直停留在第一次执行方法的位置。
var y = 0;
//定义parse()方法
function parse(){
//获取进度条p的宽度
var x = box.style.width;
x = parseInt(x) + 1;
y = y+1;
//将y值加上百分号赋值给box的宽度。这样每次+1就可以实现进度条占父容器的100%;
box.style.width = y + "%";
//将y值加上百分号并赋值给显示下载百分比的p上
document.getElementById("percent").innerHTML = y + "%";
//判断当y已经100的时候，也就是进度条的宽度和父容器的宽度一致的时候停止。
if (y >= 100) {
clearInterval(id);
document.getElementById("percent").innerHTML = "100%";
document.getElementById("box").innerHTML = "下载完毕!";
}
}
//每10毫秒调用一下parse()方法.
var id = setInterval("parse()",10);
//当单机父容器时，进度条停止
document.getElementById("content").onclick = function(){
clearInterval(id);
} 


</script>
</body>
</html>

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