前言：其实本来是要做全类型文件预览的，但是一直找不到合适的doc,xlx,ppt预览插件。要是有可以使用的，可以评论推荐给我

我使用的node版本：v18.19.1

参考官网：preview 文件预览 | ran

引入方式：

//安装组件
npm install ranui --save
//在需要的页面引入即可
import 'ranui/button';
import 'ranui/preview';
import 'ranui/style';
//使用方式

<div class="preview-container">
    <div id="showPreview" class="preview"></div>
    <r-preview :src="url" closeable="false"></r-preview>
</div>

我这里多了个showPreview用来处理ppt的预览，因为他原生的ppt预览是增加一个弹窗，我需要当前页面展示，样式不符合要求，我就修改了,\node_modules\ranui\dist\components\preview\index.js  里对应第一个文件

修改如下：

var __defProp = Object.defineProperty;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __publicField = (obj, key, value) => {
  __defNormalProp(obj, typeof key !== "symbol" ? key + "" : key, value);
  return value;
};
import { n as noop } from "./index-7913ec46.js";
import "./index-7216d6b0.js";
import { m as message } from "./index-0d5b9435.js";
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const index$2 = "";
const { warning = noop } = message;
const PPTX = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
const PDF = "application/pdf";
const DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
const XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
const XLS = "application/vnd.ms-excel";
async function Custom() {
  if (typeof document !== "undefined" && !customElements.get("r-preview") && true) {
    const { renderPptx } = await import("./index-7b8840f9.js");
    const { renderDocx } = await import("./docx-c5d02d8c.js");
    const { renderPdf } = await import("./pdf-bdb7818a.js");
    const { renderExcel } = await import("./index-c14450a9.js");
    const requestUrlToBuffer = (src, options) => {
      if (typeof XMLHttpRequest === "undefined") {
        throw new Error("XMLHttpRequest is not defined");
      }
      if (typeof document === "undefined") {
        return Promise.reject("document is not defined");
      }
      return new Promise(function(resolve, reject) {
        const xhr = new XMLHttpRequest();
        xhr.open(options.method || "GET", src, true);
        xhr.responseType = options.responseType || "arraybuffer";
        xhr.onload = function() {
          if (xhr.status === 200) {
            resolve({ success: true, data: xhr.response, message: "" });
          } else {
            reject({
              success: false,
              data: xhr.status,
              message: `The request status is${xhr.status}`
            });
          }
        };
        xhr.onerror = function(e) {
          reject({ success: false, data: e, message: `` });
        };
        xhr.onprogress = (event) => {
          options.onProgress && options.onProgress(event);
        };
        xhr.withCredentials = options.withCredentials || false;
        if (options.headers) {
          Object.keys(options.headers).forEach(function(key) {
            (options == null ? void 0 : options.headers) && xhr.setRequestHeader(key, options.headers[key]);
          });
        }
        xhr.send(options.body);
      });
    };
    const renderPpt = (file, dom) => {
      return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.readAsArrayBuffer(file);
        reader.onload = () => {
          var _a;
          if (reader.result && dom) {
            const param = {
              pptx: reader.result,
              resultElement: dom
            };
            (_a = renderPptx(param)) == null ? void 0 : _a.then(() => {
              resolve();
            });
          }
        };
        reader.onerror = (error) => {
          reject(error);
        };
        reader.onabort = (abort) => {
          reject(abort);
        };
      });
    };
    const renderWord = (file, dom) => {
      return Promise.resolve().then(
        () => renderDocx({ buffer: file, bodyContainer: dom })
      );
    };
    const renderFileMap = /* @__PURE__ */ new Map([
      [PDF, renderPdf],
      [PPTX, renderPpt],
      [DOCX, renderWord],
      [XLSX, renderExcel],
      [XLS, renderExcel]
    ]);
    class CustomElement extends HTMLElement {
      constructor() {
        super();
        __publicField(this, "_loadingText");
        __publicField(this, "preview");
        __publicField(this, "previewContext");
        __publicField(this, "_slot");
        __publicField(this, "_div");
        __publicField(this, "_loadingElement");
        __publicField(this, "createLoading", () => {
          this._loadingElement = document.createElement("div");
          this._loadingElement.setAttribute("class", "r-preview-loading");
          const icon = document.createElement("r-icon");
          icon.setAttribute("name", "loading");
          icon.setAttribute("size", "100");
          icon.setAttribute("color", "#1E90FF");
          icon.setAttribute("spin", "");
          this._loadingText = document.createElement("div");
          this._loadingElement.appendChild(icon);
          this._loadingText.setAttribute("class", "r-preview-loading-text");
          this._loadingElement.appendChild(this._loadingText);
          return this._loadingElement;
        });
        __publicField(this, "onProgress", (event) => {
          const num = event.loaded / event.total * 100;
          const progress = Math.min(99, num).toFixed(2) + "%";
          if (this._loadingText && this._loadingElement) {
            this._loadingText.innerText = `Loading ${progress}`;
            if (num >= 100) {
              setTimeout(() => {
                var _a;
                (_a = this.preview) == null ? void 0 : _a.removeChild(this._loadingElement);
              }, 300);
            }
          }
        });
        __publicField(this, "handleFile", async (file) => {
          try {
            if (typeof file === "string") {
              const { success, data, message: message2 } = await requestUrlToBuffer(file, {
                onProgress: this.onProgress,
                responseType: "blob"
              });
              if (success && data) {
                file = new File([data], data.name, { type: data.type });
                const { type } = file;
                const handler = renderFileMap.get(type);
                if (handler && this.previewContext) {
                  if (type === XLSX || type === XLS) {
                    this.previewContext.style.setProperty("width", "100%");
                  } else {
                    this.previewContext.style.setProperty("width", "100%");
                  }
                  handler(file, this.previewContext);
                }
              } else {
                warning(message2);
              }
            }
          } catch (error) {
          }
        });
        __publicField(this, "closePreview", () => {
          if (this.preview) {
            document.body.removeChild(this.preview);
            this.preview = void 0;
          }
        });
        __publicField(this, "showPreview", () => {
          var _a;
          if (this.src) {
            if (this.preview) {
              this.preview.style.display = "block";
            } else {
              this.preview = document.createElement("div");
              this.preview.setAttribute("class", "r-preview-mask");
              this.preview.setAttribute("id", "r-preview-mask");
              const previewOption = document.createElement("div");
              previewOption.setAttribute("class", "r-preview-options");
              if (this.closeable !== "false") {
                const previewCloseButton = document.createElement("r-icon");
                previewCloseButton.setAttribute(
                  "class",
                  "r-preview-options-close"
                );
                previewCloseButton.setAttribute("name", "close-circle-fill");
                previewCloseButton.setAttribute("size", "40");
                previewCloseButton.addEventListener("click", this.closePreview);
                previewOption.appendChild(previewCloseButton);
              }
              const previewContain = document.createElement("div");
              previewContain.setAttribute("class", "r-preview-contain");
              this.previewContext = document.createElement("div");
              this.previewContext.setAttribute("class", "r-preview-context");
              previewContain.appendChild(this.previewContext);
              this.preview.appendChild(previewOption);
              (_a = this.preview) == null ? void 0 : _a.appendChild(previewContain);
              this._loadingElement = this.createLoading();
              this.preview.appendChild(this._loadingElement);
              document.getElementById('showPreview').appendChild(this.preview);
              // document.body.appendChild(this.preview);
            }
            this.handleFile(this.src);
          }
        });
        this._div = document.createElement("div");
        this.preview = document.getElementById("r-preview-mask");
        this._slot = document.createElement("slot");
        this._div.appendChild(this._slot);
        this._slot.setAttribute("class", "r-preview-slot");
        this._div.setAttribute("class", "r-preview");
        const shadowRoot = this.attachShadow({ mode: "closed" });
        const F7170EE498E0DD32CBDCB63FBA8F75CC = document.createElement("style");
        F7170EE498E0DD32CBDCB63FBA8F75CC.textContent = f7170ee498e0dd32cbdcb63fba8f75cc;
        shadowRoot.appendChild(F7170EE498E0DD32CBDCB63FBA8F75CC);
        shadowRoot.appendChild(this._div);
      }
      static get observedAttributes() {
        return ["src", "closeable"];
      }
      get label() {
        return this.getAttribute("label");
      }
      set label(value) {
        if (value)
          this.setAttribute("label", value);
      }
      get src() {
        return this.getAttribute("src");
      }
      set src(value) {
        if (value)
          this.setAttribute("src", value);
      }
      get closeable() {
        return this.getAttribute("closeable");
      }
      set closeable(value) {
        if (value)
          this.setAttribute("closeable", value);
      }
      connectedCallback() {
        this.preview = document.getElementById("r-preview-mask");
        this.addEventListener("click", this.showPreview);
      }
      disconnectedCallback() {
        this.removeEventListener("click", this.showPreview);
      }
      attributeChangedCallback(name, oldValue, newValue) {
        if (newValue !== oldValue) {
          if (name === "src" && newValue) {
            this.setAttribute("src", newValue);
            this.showPreview();
          }
        }
      }
    }
    customElements.define("r-preview", CustomElement);
  }
}
const index = Custom();
const index$1 = /* @__PURE__ */ Object.freeze(/* @__PURE__ */ Object.defineProperty({
  __proto__: null,
  default: index
}, Symbol.toStringTag, { value: "Module" }));
export {
  index as a,
  index$1 as i
};

以及一点点的样式修改

<style lang="scss">
  /*deep*/#r-preview-mask{
    position: static;
    width: calc(100vw - 230px);
    /* margin-left: 210px; */
    height: 100%;
    &>section{
      width: 100% !important;
    }
  }
</style>

好像是pdf在预览时样式很奇怪：所以pdf我是通过ifream进行预览

 <iframe :src="url" class="pdfBox"></iframe>