javascript 将URL转换为Blob、base64

<script>
            // 图片地址 转为 blob 、base64格式 imgUrl类型为字符串string
            function base64ByURL (imgUrl) {
            // 两大重点 Promise  XMLHttpRequest
                return new Promise(resolve => {
                    var xhr = new XMLHttpRequest();
                    xhr.open("get", imgUrl, true);
                    xhr.responseType = "blob";
                    xhr.onload = function () {
                        if (this.status == 200) {
                            let blob = this.response;
                            let oFileReader = new FileReader();
                            oFileReader.onloadend = function (e) {
                                resolve({blob,base64:e.target.result})
                            };
                            oFileReader.readAsDataURL(blob);
                        }
                    };
                    xhr.send();
                });
            };
 
 
            // 调用
            base64ByURL().then(res=>{
                let {blob,base64} = res;
                console.log(blob,base64,"blob,base64")
            });
</script>

__EOF__

本文作者：时光
本文链接：https://www.cnblogs.com/SHGG/p/18331425.html
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