解决方案
function mergeImgs(list) {
const imgDom = document.createElement( 'img' )
document.body.appendChild(imgDom)
const canvas = document.createElement( 'canvas' )
canvas.width = 500
canvas.height = 500 * list.length
const context = canvas.getContext( '2d' )
list.map((item, index) => {
const img = new Image()
img.src = item
// 跨域
img.crossOrigin = 'Anonymous'
img.onload = () => {
context.drawImage(img, 0, 500 * index, 500, 500)
const base64 = canvas.toDataURL( 'image/png' )
imgDom.setAttribute( 'src' , base64)
// console.log(baseList)
}
})
}
const urlList = [ './img/timg%20(1).jpg' , './img/timg.jpg' ]
mergeImgs(urlList )
代码稍微优化一下，改成公共方法
/**
* 合并多张图片，返回新的图片
* @param {Array} list 图片url数组
* @param {Number} cwith 画布宽度 默认500
* @param {Number} cheight 画布高度 默认500
*/
function mergeImgs(list, cwith = 500, cheight = 500) {
return new Promise((resolve, reject) => {
const baseList = []
const canvas = document.createElement( 'canvas' )
canvas.width = cwith
canvas.height = cheight * list.length
const context = canvas.getContext( '2d' )
list.map((item, index) => {
const img = new Image()
img.src = item
// 跨域
img.crossOrigin = 'Anonymous'
img.onload = () => {
context.drawImage(img, 0, cheight * index, cwith, cheight)
const base64 = canvas.toDataURL( 'image/png' )
baseList.push(base64)
if (baseList[list.length - 1]) {
console.log(baseList)
// 返回新的图片
resolve(baseList[list.length - 1])
}
}
})
})
}
const urlList = [ './img/timg%20(1).jpg' , './img/timg.jpg' ]
mergeImgs(urlList ).then(base64 => {
const imgDom = document.createElement( 'img' )
imgDom.src = base64
document.body.appendChild(imgDom)
})
效果
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原文链接：https://blog.csdn.net/weixin_45337170/article/details/115318940
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