windos环境 node使用canvas

windos环境 node使用canvas
#1.安装canvas前需要安装python环境
npm install --global --production windows-build-tools@4.0.0
或者
npm install --global --production windows-build-tools
或单独安装
Python 环境
npm install --python=python2.7
npm config set python python2.7

如果安装过程中出现
*Please restart this script from an administrative PowerShell!
则需要

在执行上面的安装命令

安装成功后 ：

在项目里执行 npm install canvas

#2.使用示例

const fs = require("fs");
const path = require("path");
const { createCanvas, loadImage } = require('canvas')
const width = 750
const height = 1334
const canvas = createCanvas(width, height)
const context = canvas.getContext('2d')
function(){
	let bgImg=//背景图片地址
	        let qrcodeImg = `//图片保存路径
	        let bgImg=`./app/public/other/share_bg/${useImg.src}.jpg`
	        let res2=//需要合成定位的图片
	
	      await  loadImage(bgImg).then(image => {
	           return context.drawImage(image, 0, 0, width, height)
	        })
	        await loadImage(res2).then(image => {
	            return  context.drawImage(image, 200, 600, 350, 350)
	          })
	        const buffer = canvas.toBuffer('image/png')
	        fs.writeFileSync(qrcodeImg, buffer)
	       return  qrcodeImg 
}