前些日子做了一个项目关于vue项目需要头像裁剪上传功能,看了一篇文章,在此基础上做的修改完成了这个功能,与大家分享一下。原文:
首先下载引入cropper js,
在需要的页面引入:import Cropper from "cropper js"
html的代码如下:
3.methods的方法比较多,包括创建URL路径,input框change事件,canvas画图,确定提交上传。我还加了取消事件函数,判断上传文件的类型和大小。
5242880) {
alert("请选择5M以内的图片!");
return false;
}
this.picValue = files[0];
this.url = this.getObjectURL(this.picValue);
//每次替换图片要重新得到新的url
if (this.cropper) {
this.cropper.replace(this.url);
}
this.panel = true;
},//确定提交
commit() {
this.panel = false;
var croppedCanvas;
var roundedCanvas;
if (!this.croppable) {
return;
}
// Crop
croppedCanvas = this.cropper.getCroppedCanvas();
// Round
roundedCanvas = this.getRoundedCanvas(croppedCanvas);
this.headerImage = roundedCanvas.toDataURL();
//上传图片
this.postImg();
},//canvas画图
getRoundedCanvas(sourceCanvas) {
var canvas = document.createElement("canvas");
var context = canvas.getContext("2d");
var width = sourceCanvas.width;
var height = sourceCanvas.height;
canvas.width = width;
canvas.height = height;
context.imageSmoothingEnabled = true;
context.drawImage(sourceCanvas,width,height);
context.globalCompositeOperation = "destination-in";
context.beginPath();
context.arc(
width / 2,height / 2,Math.min(width,height) / 2,2 * Math.PI,true
);
context.fill();
return canvas;
},//提交上传函数
postImg() {
alert("上传成功");
//这边写图片的上传
}
}