标签：eve lease 网易 优先级 bim cti star 完成 type
1.pc端：
<canvas id=‘canvas‘ width="500" height="500"></canvas>
<!-- <img src="http://gss0.baidu.com/-4o3dSag_xI4khGko9WTAnF6hhy/lvpics/h=800/sign=b49dc48f8718367ab28972dd1e728b68/9922720e0cf3d7ca7f0736d0f31fbe096a63a9a6.jpg" > -->
<button id="save">保存</button>
<script type="text/javascript">
window.onload = function(){
var canvas = document.getElementById(‘canvas‘)
var ctx = canvas.getContext(‘2d‘)
// 内存中先加载，然后当内存加载完毕时，再把内存中的数据填充到我们的 dom元素中，这样能够快速的去
// 反应，比如网易的图片
var img = new Image();
img.setAttribute("crossOrigin",‘anonymous‘);//需要放在图片赋值前，否则部分浏览器会报错
img.onload = function(){
// alert(‘加载完毕‘)
// 将图片画到canvas上面上去！
ctx.drawImage(img,593,327,500,500,100,100,300,300);
}
img.src = "http://gss0.baidu.com/-4o3dSag_xI4khGko9WTAnF6hhy/lvpics/h=800/sign=b49dc48f8718367ab28972dd1e728b68/9922720e0cf3d7ca7f0736d0f31fbe096a63a9a6.jpg";
// img.src = "http://rc.rry.info/app/index.php?i=1&c=entry&m=ewei_shopv2&do=mobile&r=order.pay.chanPayQrcode&url=https://qr.alipay.com/bax062248bb2tkmy1ubv2071";
}
document.getElementById("save").onclick = function (){
console.log(‘canvas‘,canvas)
downLoad(saveAsJPG(canvas));
}
// 保存成png格式的图片
function saveAsPNG(canvas) {
return canvas.toDataURL("image/png");
}
// 保存成jpg格式的图片
function saveAsJPG(canvas) {
return canvas.toDataURL("image/jpeg");
}
function downLoad(url){
var oA = document.createElement("a");
oA.download = ‘img‘;// 设置下载的文件名，默认是‘下载‘
oA.href = url;
document.body.appendChild(oA);
oA.click();
oA.remove(); // 下载之后把创建的元素删除
}
</script>
2.移动端：此方法针对多组图片，多个图片可以添加相同的class然后js根据class的长度来进行操作。其中主要用到plus.downloader.createDownload(url, options, completedCB);
<img src="H5canvas鼠标经过的地方星星连接/xkbg.png" id="image">
<!-- 弹框的html-->
<div id="picture" class="mui-popover mui-popover-action mui-popover-bottom" style="z-index: 99999999">
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a href="javascript:;" id="saveImg">保存图片</a>
</li>
</ul>
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a href="#picture"><b>取消</b></a>
</li>
</ul>
</div>
<script type="text/javascript">
mui.init( { gestureConfig:{
tap: true, //默认为true
doubletap: true, //默认为false
longtap: true, //默认为false
swipe: true, //默认为true
drag: true, //默认为true
hold:true,//默认为false，不监听
release:false//默认为false，不监听
}});
document.getElementById(‘image‘).onclick = function(){
//给需要长按保存图片的img标签设置 class=‘saveImg‘
var divs = document.getElementsByClassName(‘saveImg‘);
for(var i = 0;i<divs.length;i++){
divs[i].addEventListener(‘longtap‘, function () {
//开启弹框
mui(‘#picture‘).popover(‘toggle‘);
console.log(this.src)
var imgurl = this.src;
document.getElementById(‘saveImg‘).addEventListener(‘tap‘, function () {
var imgDtask = plus.downloader.createDownload(imgurl,{method:‘GET‘}, function (d,status) {
if(status == 200){
plus.gallery.save(d.filename, function () {//保存到相册
plus.io.resolveLocalFileSystemURL(d.filename, function (enpty) {
// 关闭弹框
mui(‘#picture‘).popover(‘toggle‘);
mui.toast(‘保存成功‘)
});
})
}else{
mui.toast(‘保存失败‘)
}
});
imgDtask.start();
});
})
}
}
</script>
3.移动端单张图片：注意plus.downloader.createDownload(url, options, completedCB)中的url是图片在服务器端的路径比如：https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1335795923,3245280170&fm=15&gp=0.jpg这种格式，而不是文件资源！
<script src="js/mui.min.js"></script>
<link href="css/mui.min.css" rel="stylesheet"/>
<script src="js/jquery-2.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
mui.init();
</script>
<style type="text/css">
#imageList{
display: flex;
}
.cs{
width: 0;
height: 0;
}
.saveImg1{
width: 100%;
height: 100%;
visibility: hidden;
}
</style>
</head>
<body>
<!-- <img id="image" style="width: 300px;height: 300px;" src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1571203612306&di=42932c7868bcb8054af73d53d0b24ff6&imgtype=0&src=http%3A%2F%2Fhbimg.b0.upaiyun.com%2F28ea2e5cf17173f84ef74064e95627cc3ba75fe627e71-hKNgS4_fw658" > -->
<div class="imageList">
<div id="">
<canvas id=‘canvas‘ width="300" height="300"></canvas>
</div>
<div class="cs">
<img class="saveImg1" style="width: 200px;height: 200px;" src="https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1335795923,3245280170&fm=15&gp=0.jpg" >
</div>
<div id="image">
保存
</div>
</div>
<!-- 弹框的html-->
<div id="picture" class="mui-popover mui-popover-action mui-popover-bottom" style="z-index: 99999999">
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a href="javascript:;" id="saveImg">保存图片</a>
</li>
</ul>
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a href="#picture"><b>取消</b></a>
</li>
</ul>
</div>
<script type="text/javascript">
mui.init( { gestureConfig:{
tap: true, //默认为true
doubletap: true, //默认为false
longtap: true, //默认为false
swipe: true, //默认为true
drag: true, //默认为true
hold:true,//默认为false，不监听
release:false//默认为false，不监听
}});
window.onload = function(){
var canvas = document.getElementById(‘canvas‘)
var ctx = canvas.getContext(‘2d‘)
// 内存中先加载，然后当内存加载完毕时，再把内存中的数据填充到我们的 dom元素中，这样能够快速的去
// 反应，比如网易的图片
var img = new Image();
img.setAttribute("crossOrigin",‘anonymous‘);//需要放在图片赋值前，否则部分浏览器会报错
img.onload = function(){
// 将图片画到canvas上面上去！
ctx.drawImage(img,593,327,500,500,100,100,300,300);
}
img.src = "http://gss0.baidu.com/-4o3dSag_xI4khGko9WTAnF6hhy/lvpics/h=800/sign=b49dc48f8718367ab28972dd1e728b68/9922720e0cf3d7ca7f0736d0f31fbe096a63a9a6.jpg";
// img.src = "http://rc.rry.info/app/index.php?i=1&c=entry&m=ewei_shopv2&do=mobile&r=order.pay.chanPayQrcode&url=https://qr.alipay.com/bax062248bb2tkmy1ubv2071";
$(‘.saveImg1‘).attr(‘src‘,img.src)
}
// document.getElementById(‘image‘).addEventListener(‘tap‘,function(){
console.log(‘点击图片了‘)
//给需要长按保存图片的img标签设置 class=‘saveImg‘
var divs = $(‘.saveImg1‘);
$(‘#canvas‘)[0].addEventListener(‘longtap‘, function () {
//开启弹框
mui(‘#picture‘).popover(‘toggle‘);
var imgurl = divs[0].src;
document.getElementById(‘saveImg‘).addEventListener(‘tap‘, function () {
var imgDtask = plus.downloader.createDownload(imgurl,{method:‘GET‘}, function (d,status) {
console.log(typeof(imgurl))
console.log(imgurl)
console.log(JSON.stringify(d))
console.log(JSON.stringify(status))
if(status == 200){
plus.gallery.save(d.filename, function () {//保存到相册
plus.io.resolveLocalFileSystemURL(d.filename, function (enpty) {
// 关闭弹框
mui(‘#picture‘).popover(‘toggle‘);
mui.toast(‘保存成功‘)
});
})
}else{
mui.toast(‘保存失败‘)
}
});
imgDtask.start();
});
})
</script>
4.自己用canvas画图并下载
<div id="app"></div>
<canvas id="canvas" width="400" height="400"></canvas>
<div>
<button id="save">保存</button>
</div>
</body>
<script>
var arr = [
{locations:[[0,0],[200,200],[0,400]],color:"red"},
{locations:[[0,0],[400,0],[200,200]],color:"orange"},
{locations:[[0,400],[100,300],[200,400]],color:"yellow"},
{locations:[[100,300],[200,200],[300,300],[200,400]],color:"green"},
{locations:[[300,100],[200,200],[300,300]],color:"blue"},
{locations:[[300,100],[400,0],[400,200],[300,300]],color:"indigo"},
{locations:[[200,400],[400,400],[400,200]],color:"purple"}
];
var oCanvas = document.getElementById("canvas");
var ctx = oCanvas.getContext("2d");
for(let i=0;i<arr.length;i++){
draw(arr[i],ctx);
}
function draw(item,ctx){
ctx.beginPath();
ctx.moveTo(item.locations[0][0],item.locations[0][1]);
for(let i = 0;i<item.locations.length;i++){
let x = item.locations[i][0];
let y = item.locations[i][1];
ctx.lineTo(x,y);
console.log(1234567)
}
ctx.closePath();
ctx.fillStyle = item.color;
ctx.fill();
ctx.strokeStyle = "#000";
ctx.lineWidth = 2;
ctx.stroke();
}
var imgId = document.getElementById("imgId");
document.getElementById("save").onclick = function (){
console.log(‘canvas‘,canvas)
downLoad(saveAsPNG(canvas));
}
// 保存成png格式的图片
function saveAsPNG(canvas) {
return canvas.toDataURL("image/png");
}
// 保存成jpg格式的图片
function saveAsJPG(canvas) {
return canvas.toDataURL("image/jpeg");
}
// 保存成bmp格式的图片 目前浏览器支持性不好
function saveAsBMP(canvas) {
return canvas.toDataURL("image/bmp");
}
/**
* @author web得胜
* @param {String} url 需要下载的文件地址
* */
function downLoad(url){
var oA = document.createElement("a");
oA.download = ‘img‘;// 设置下载的文件名，默认是‘下载‘
oA.href = url;
document.body.appendChild(oA);
console.log(oA)
oA.click();
oA.remove(); // 下载之后把创建的元素删除
}
</script>
标签：eve lease 网易 优先级 bim cti star 完成 type
原文地址：https://www.cnblogs.com/Dark-fire-liehuo/p/11686865.html
