javascript – angular ajax：在位置0的JSON中出现意外的令牌

我正在尝试在http post请求中发送html作为json.但是,当我尝试生成$http.post请求时,我遇到以下错误：

angular.js:12783 SyntaxError: Unexpected token I in JSON at position 0
    at Object.parse (native)
    at fromJson (http://localhost:9001/bower_components/angular/angular.js:1274:14)
    at defaultHttpResponseTransform (http://localhost:9001/bower_components/angular/angular.js:9703:16)
    at http://localhost:9001/bower_components/angular/angular.js:9794:12
    at forEach (http://localhost:9001/bower_components/angular/angular.js:341:20)
    at transformData (http://localhost:9001/bower_components/angular/angular.js:9793:3)
    at transformResponse (http://localhost:9001/bower_components/angular/angular.js:10582:21)
    at processQueue (http://localhost:9001/bower_components/angular/angular.js:15097:28)
    at http://localhost:9001/bower_components/angular/angular.js:15113:27
    at Scope.$eval (http://localhost:9001/bower_components/angular/angular.js:16359:28)

我的代码(角度)如下：

$scope.generate_pdf = function() {
    var html =  angular.element('html').html(); // get all html

    var service = API.getService();
    // JSON.stringify( { html:  html } this also cause same error
    service.downloadPdf({},{ html: html },function(res) {
        console.log("res : ",res);
      },function(err) {
        console.log("err : ",err);
      });


  };

我怎么解决这个问题？提前致谢

解决方法

SyntaxError：位于0的JSON中的意外令牌I意味着服务器响应无效JSON,打开控制台中的网络选项卡并检查请求的响应以查看错误.