关于javascript:cryptojsvueelupload-计算文件hashsha256

crypto-js+vue+el-upload 计算文件hash(sha256)

下载crypto-js

npm i crypto-js

如何应用

index.vue

<template>    <el-upload ref="upload" drag action :http-request="uploadCrt"></el-upload></template><script>    import CryptoJS from 'crypto-js'    export default {        ...        methods: {             uploadCrt(param) {                var contractFile = param.file;                var reader = new FileReader(), self = this;;                var blobSlice = File.prototype.mozSlice || File.prototype.webkitSlice || File.prototype.slice;                var chunkSize = 6 * 1024 * 1024;                var chunks = Math.ceil(contractFile.size / chunkSize);                var currentChunk = 0;                var hasher = CryptoJS.algo.SHA256.create();                var start = currentChunk * chunkSize;                var end = start + chunkSize >= contractFile.size ? contractFile.size : start + chunkSize;                reader.readAsArrayBuffer(blobSlice.call(contractFile, start, end));                reader.onload = function (evt) {                    var fileStr = evt.target.result;                    var tmpWordArray = self.arrayBufferToWordArray(fileStr);                    hasher.update(tmpWordArray);                    currentChunk += 1;                    fileStr = null;                    tmpWordArray = null;                    if (currentChunk < chunks) {                        var start = currentChunk * chunkSize;                        var end = start + chunkSize >= contractFile.size ? contractFile.size : start + chunkSize;                        reader.readAsArrayBuffer(blobSlice.call(contractFile, start, end));                    }                }                reader.onloadend = function () {                    contractFile = null;                    var hash = hasher.finalize();                    hash.toString();//计算结果                    hasher = null;                    blobSlice = null;                    reader = null;                    hash = null;                }            },            arrayBufferToWordArray(ab) {                var i8a = new Uint8Array(ab);                var a = [];                for (var i = 0; i < i8a.length; i += 4) {                    a.push(i8a[i] << 24 | i8a[i + 1] << 16 | i8a[i + 2] << 8 | i8a[i + 3]);                }                return CryptoJS.lib.WordArray.create(a, i8a.length);            },        }    }</script>