]for(let img of imgs) { let image=newImage() image.src=img image.onload= () =>{ console.log("image.onload:length:"+imgs.length); console.log("image.onload:src:"+image.src); loadCount.value++//计算图片加载的百分数,绑定到
let image=newImage(); image.setAttribute("crossOrigin", "anonymous"); image.src=url; image.onload= () =>{ let canvas= document.createElement("canvas"); canvas.width=image.width; canvas.height=image.height; let ctx= canvas.getContext("2d"); ctx.drawImage(image,0, 0, image.width, image...
import defaultImg from "@/assets/images/default.png"; //异步加载图片 let imageAsync = (url) => { return new Promise((resolve, reject) => { let img = new Image(); img.src = url; img.onload = () => { resolve(); }; img.onerror = (err) => { reject(err); }; }); };...
const lazyImages = document.querySelectorAll('.lazy-image'); // 观察每个图片元素 lazyImages.forEach(image => { observer.observe(image); }); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 实践 接下来我们实现一个通...
@load="imgOnLoad" => 图片加载完成 触发事件。 offsetWidth/offsetHeight:获取元素的宽度/高度(content+padding+border) 。 <template>图片{{index+1}}</template>exportdefault{data(){return{images:['src/assets/1.jpg','src/assets/2.jpg','src/assets/3.jpg','src/assets/5.jpg','src/assets/4.jp...
img.getAttribute('data-src'); img.setAttribute('src', src); // 停止观察该元素 observer.unobserve(img); } }); }); // 获取所有需要懒加载的图片元素 const lazyImages = document.querySelectorAll('.lazy-image'); // 观察每个图片元素 lazyImages.forEach(image => { observer.observe(image);...
image.onload = function () { // 图片加载完成时执行,此时可通过image.width和image.height获取到图片原始宽高 const height = image.height / (image.width / (imageWidth.value as number)) imagesProperty.value[n] = { // 存储图片宽高和位置信息 ...
image.onload = () => { // 5个参数分别为:图片、x原点、y原点、宽度、高度 stickerCtx?.drawImage(image, 0, 0, width, width); // 不显示贴图在文档流中 sticker.style.display = 'none'; generateMap(value); }; }; const generateMap = (value?: echarts.SeriesOption) => { ...
value; if (imgURL) { const exist = await imageIsExist(imgURL); exist && el.setAttribute('src', imgURL); } // 判断一个图片是否存在, 注意是异步行为 function imageIsExist(url) { return new Promise(resolve => { let img = new Image(); img.src = url; img.onload = () => { if...
imageSrc: null } }, methods: { onFileChange(event) { const file = event.target.files[0]; if (file) { const reader = new FileReader(); reader.onload = e => { this.imageSrc = e.target.result; }; reader.readAsDataURL(file); ...