error - canvas- Failed to execute 'toBlob' on 'HTMLCanvasElement': Tainted canvases may not be exported.
- Failed to execute 'toBlob' on 'HTMLCanvasElement': Tainted canvases may not be exported.
原因就在于使用了跨域的图片,所以说是被污染的画布。
解决方案如下
1】为image请求添加跨域
var image = new Image()
image.setAttribute("crossOrigin",'anonymous')
image.src = src
但也许有可能服务器不让你跨域请求图片(也不知道为啥),那么用到方案2
2】通过把请求的图片转化成base64再进行使用
代码如下
function getURLBase64(url) {
return new Promise((resolve, reject) => {
var xhr = new XMLHttpRequest()
xhr.open('get', url, true)
xhr.responseType = 'blob'
xhr.onload = function() {
if (this.status === 200) {
var blob = this.response
var fileReader = new FileReader()
fileReader.onloadend = function(e) {
var result = e.target.result
resolve(result)
}
fileReader.readAsDataURL(blob)
}
}
xhr.onerror = function() {
reject()
}
xhr.send()
})
}
Lee2