今天朋友圈又火了，听说原因是 @腾讯官网 就能得到一顶绿色的帽子，啊呸，是一个好看的国庆节头像，可是听说没一会就502了，那么我们自己动手实现一个吧
由于代码比较简单就不一一介绍了。
var cvs = document.getElementById("cvs");var ctx = cvs.getContext("2d");var exportImage = document.getElementById("export");var img = document.getElementById("img");var hat = "hat6";var canvasFabric;var hatInstance;var screenWidth = window.screen.width < 500 ? window.screen.width : 300;function viewer() { var file = document.getElementById("upload").files[0]; console.log(file); var reader = new FileReader; if (file) { reader.readAsDataURL(file); reader.onload = function(e) { img.src = reader.result; img.onload = function() { img2Cvs(img) } } } else { img.src = "" }}function img2Cvs(img) { cvs.width = img.width; cvs.height = img.height; cvs.style.display = "block"; canvasFabric = new fabric.Canvas("cvs", { width: screenWidth, height: screenWidth, backgroundImage: new fabric.Image(img, { scaleX: screenWidth / img.width, scaleY: screenWidth / img.height }) }); changeHat(); document.getElementById("uploadContainer").style.display = "none"; document.getElementById("uploadText").style.display = "none"; document.getElementById("upload").style.display = "none"; document.getElementById("change").style.display = "block"; document.getElementById("exportBtn").style.display = "block"; document.getElementById("tip").style.opacity = 1}function changeHat() { document.getElementById(hat).style.display = "none"; var hats = document.getElementsByClassName("hide"); hat = "hat" + (+hat.replace("hat", "") + 1) % hats.length; var hatImage = document.getElementById(hat); hatImage.style.display = "block"; if (hatInstance) { canvasFabric.remove(hatInstance) } hatInstance = new fabric.Image(hatImage, { top: 40, left: screenWidth / 3, scaleX: 100 / hatImage.width, scaleY: 100 / hatImage.height, cornerColor: "#0b3a42", cornerStrokeColor: "#fff", cornerStyle: "circle", transparentCorners: false, rotatingPointOffset: 30 }); hatInstance.setControlVisible("bl", false); hatInstance.setControlVisible("tr", false); hatInstance.setControlVisible("tl", false); hatInstance.setControlVisible("mr", false); hatInstance.setControlVisible("mt", false); canvasFabric.add(hatInstance)}function exportFunc() { document.getElementsByClassName("canvas-container")[0].style.display = "none"; document.getElementById("exportBtn").style.display = "none"; document.getElementById("tip").innerHTML = "长按图片保存或分享"; document.getElementById("change").style.display = "none"; cvs.style.display = "none"; exportImage.style.display = "block"; exportImage.src = canvasFabric.toDataURL({ width: screenWidth, height: screenWidth })}
最后效果
拖动图片可见已经拼合成一张完整图片了
右键查看源代码
所有图片素材均来自腾讯官网
源码地址：https://gitee.com/alterem/avatar
演示地址：http://alterem.gitee.io/avatar/
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本文标题: java 教你如何给你的头像添加一个好看的国旗
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