pdf.js如何跨域读取pdf文件？

You can modify the defaultUrl app option in the web/app_options.js file or you can append the ?file= query string to the viewer URL, e.g. http://mozilla.github.com/pdf.js/web/viewer.html?file=compressed.tracemonkey-pldi-09.pdf. In the latter case, the PDF path/URL must be encoded using encodeURIComponent().

The viewer can be started without any PDF loaded by setting the defaultUrl app option to an empty string or by using the ?file= query string without any location specified. Use PDFViewerApplication.open(file) to load the PDF file later.

You can use raw binary data to open a PDF document: use Uint8Array instead of URL in the PDFViewerApplication.open call. If you have base64 encoded data, please decode it first -- not all browsers have atob or data URI scheme support. (The base64 conversion operation uses more memory, so we recommend delivering raw PDF data as typed array in first place.)

<?php
//直接使用file_get_contents获取再输出就行
$file = file_get_contents($url);
echo $file;
?>

var PDFData = "";
var getUrl = "";
var baseUrl = "http://www.zdxhxfzxwx.com.img26752.200cdn.com:9898";
getUrl = baseUrl + getQueryString("filePath");
$.ajax({  
    type:"post",  
    async:false,  //
    contentType: "application/x-www-form-urlencoded",
    mimeType: ‘text/plain; charset=x-user-defined‘,  
    url:"/plus/getFileToBinary.php",  
    success:function(data){  
       PDFData = data;  
    },
    data: {
      "url": getUrl,
    }
});  
var rawLength = PDFData.length;  
console.log(rawLength);
//转换成pdf.js能直接解析的Uint8Array类型,见pdf.js-4068  
var array = new Uint8Array(new ArrayBuffer(rawLength));    
for(i = 0; i < rawLength; i++) {  
  array[i] = PDFData.charCodeAt(i) & 0xff;  
}  
DEFAULT_URL = array; 
function getQueryString(name) { 
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i"); 
    var r = window.location.search.substr(1).match(reg); 
    if (r != null) return unescape(r[2]); 
    return null; 
}