JS进度条效果实现代码整理_javascript技巧

 第一种方法:
Loading.js
代码如下:
//频率
var frequency = 50;
//步长
var step = 3;
//背景颜色
var loadingBgcolor = "#ffffff";
//宽度
var loadingWidth = 354;

/*
*参数说明:
*content：显示内容，可以为空；
*imageURL：将引用JS文件的路径设置即可；
*left：进度条显示位置left
*top：进度条显示位置top
*/
function Loading(content, imageURL, left, top)
{
imageURL = imageURL + "Loading.jpg";

LoadTable(content, imageURL, left, top);
showimage.style.display="";
window.setInterval("RefAct();", frequency);
}

function RefAct()
{
imgAct.width += step;
if(imgAct.width > loadingWidth-4)
{
imgAct.width = 0;
}
}

function LoadTable(content, imageURL, left, top)
{
var strLoading;
strLoading = "";
strLoading += "";
strLoading += "

";
if(content != "")
{
strLoading += "";
strLoading += "";
strLoading += "";
strLoading += "";
}
strLoading += "";
strLoading += "";
strLoading += "

"; strLoading += "" + content + ""; strLoading += "

"; strLoading += ""; strLoading += "

";
strLoading += "";

document.getElementById("loading_div").innerHTML = strLoading;
}

使用页:
代码如下:

第二种方法：
JS实现进度显示功能
代码如下:
progress.js类文件：

$ = function (id) {
return document.getElementById(id);
}
//文本转JSON字符串
String.prototype.toJson = function () {
if (this == ) {
return null;
}
else {
try {
return eval(( + this.replace(/rn/g, rn) + ));
}
catch (err) {
}
}
};
//字符格式化方法
String.prototype.format = function () {
var newStr = this;
var reg = null;
for (var i = 0; i < arguments.length; i++) {
reg = RegExp('{' + (i) + '}', 'gm');
newStr = newStr.replace(reg, arguments[i]);
}
return newStr;
};
//进度条类
function Progress(objId) {
//window.setInterval对象
this.interval = null;
//进度条对象ID
this.id = objId;
//当前进度 起始进度为0
this.progress = 0;
//进度条显示进度的DIV ID
this.progressId = inner + this.id;
//进度条边框ID
this.progressFrameId = frame + this.id;
//进度条类参数配置
this.config = {
//宽度
width: 150,
//高度
height: 20,
//左边距
left: 0,
//顶部边距
top: 0,
//进度颜色
progressColor: red,
//边框颜色
borderColor: #ccc,
//边框宽度
borderHeight: 2,
//进度完成后间隔N秒后隐藏进度条 0为立即隐藏
hiddenSplit:2000
};
}
//进度条类初始化方法
Progress.prototype.init = function () {
//新建进度条边框DIV
var progressdiv = document.createElement(div);
//边框DIV样式
var progressdiv_css_text = position:absolute;width:{0}px;height:{1}px;left:{2}px;top:{3}px;border:{4} {5}px solid;.format
(
this.config.width,
this.config.height,
this.config.left,
this.config.top,
this.config.borderColor,
this.config.borderHeight
);
//重置进度为0
this.progress = 0;
//设置边框ID
progressdiv.id = this.progressFrameId;
//设置边框样式
progressdiv.style.cssText = progressdiv_css_text;
//设置进度条HTML
progressdiv.innerHTML = '

'.format(this.progressId, this.config.height, this.config.progressColor);
//加入body中
document.body.appendChild(progressdiv);
};
//进度条隐藏函数
Progress.prototype.hiddenProgress = function () {
document.body.removeChild(document.getElementById(this.progressFrameId));
window.clearInterval(this.interval);
}
//进度结束时触发的函数
Progress.prototype.complete = function () {
window.clearInterval(this.interval);
this.interval = window.setTimeout(this.id+.hiddenProgress();,this.config.hiddenSplit);
if (this.completeCallBack) {
this.completeCallBack();
}
}
//进度每次运行后的回调函数
Progress.prototype.callback = function () {
var progressDiv = document.getElementById(this.progressId);
var progressFrameDiv = document.getElementById(this.progressFrameId);
progressDiv.innerHTML = (this.progress*100)+ %;
progressFrameDiv.title = 上传进度: + (this.progress*100) + %;
progressDiv.style.width = (this.progress*100) + %;
if (this.progress >= 1) {
this.complete();
progressDiv.innerHTML = 文件上传成功!;
}
}
//进度条运行函数。需要用户自己实现
Progress.prototype.run = function () {
alert(请实现 + this.id + .run方法以实现异步进度请求，回发回请调回调 + this.id + .callback方法。);
window.clearInterval(this.interval);
}
//启动进度
Progress.prototype.start = function () {
this.init();
this.interval = window.setInterval(this.id + .run(), 1000);
}

图片加载进度实时显示
代码如下:

var l=0;
var imgs;
var sum=0;
var imgs=new Array();
function chk(){
l--;
document.getElementById("aa").innerText=""+((sum-l)*100/sum)+"%"
if (l==0){
for (var i=0;idocument.body.innerHTML+=""
}
}
if (document.images){
imgs[0]=new Image()
imgs[1]=new Image()
imgs[2]=new Image()
imgs[3]=new Image()
imgs[4]=new Image()
imgs[5]=new Image()
imgs[6]=new Image()
imgs[7]=new Image()
imgs[0].src="https://www.gxlcms.com/Uploads//articleimg/2006/08/3859/01.jpg";
imgs[1].src="https://www.gxlcms.com/articleimg/2006/08/3859/02.jpg";
imgs[2].src="https://www.gxlcms.com/articleimg/2006/08/3859/03.jpg";
imgs[3].src="https://www.gxlcms.com/articleimg/2006/08/3859/04.jpg";
imgs[4].src="https://www.gxlcms.com/articleimg/2006/08/3859/05.jpg";
imgs[5].src="https://www.gxlcms.com/articleimg/2006/08/3859/06.jpg";
imgs[6].src="https://www.gxlcms.com/articleimg/2006/08/3859/07.jpg";
imgs[7].src="https://www.gxlcms.com/articleimg/2006/08/3859/08.jpg";
}

0%

sum=l=imgs.length;
for (var i=0;iimgs[i].onload=chk;
imgs[i].onerror=chk;//无论图片是否加载成功，都执行指定方法
}