gotouchstart() {
clearTimeout(this.timeOutEvent); //清除定时器
this.timeOutEvent = 0;
this.timeOutEvent = setTimeout(() => {
//执行长按要执行的内容，
this.saveImg();
}, 1500); //这里设置定时
},
//手释放，如果在2000毫秒内就释放，则取消长按事件，此时可以执行onclick应该执行的事件
gotouchend() {
clearTimeout(this.timeOutEvent);
if (this.timeOutEvent != 0) {
//这里写要执行的内容（尤如onclick事件）
}
},
//如果手指有移动，则取消所有事件，此时说明用户只是要移动而不是长按
gotouchmove() {
clearTimeout(this.timeOutEvent); //清除定时器
this.timeOutEvent = 0;
},
saveImg() {
let dom = document.getElementsByClassName("image")[0];
if (typeof html2canvas == null) throw Error("html2canvas is not defined");
let mixed = this.generateMixed(10);
let fileName = "二维码截图" + mixed + ".png";
var getPixelRatio = function(context) {
var backingStore =
context.backingStorePixelRatio ||
context.webkitBackingStorePixelRatio ||
1;
return (window.devicePixelRatio || 1) / backingStore;
};
var _canvas = document.createElement("canvas");
var ctx = _canvas.getContext("2d");
var ratio = getPixelRatio(ctx);
ctx.scale(ratio, ratio);
var w = dom.offsetWidth;
var h = dom.offsetHeight;
_canvas.width = w;
_canvas.height = h;
_canvas.style.width = w * ratio + "px";
_canvas.style.height = h * ratio + "px";
html2canvas(dom, {
allowTaint: false,
logging: false,
profile: true,
useCORS: true,
height: dom.scrollHeight,
width: dom.scrollWidth
}).then(canvas => {
// canvas
var dataUrl = canvas.toDataURL();
var b = new plus.nativeObj.Bitmap("bitblmap");
b.loadBase64Data(
dataUrl,
function() {
/*这里一定要是_doc目录*/
b.save(
"_doc/" + fileName,
{ overwrite: true },
function(object) {
//保存到相册
plus.gallery.save(
"_doc/" + fileName,
function() {
alert("图片已保存到相册");
},
function() {
alert("图片保存失败");
}
);
},
function() {
alert("图片保存失败");
}
);
},
function() {
alert("图片保存失败");
}
);
});
}
