如何在C++中获取中数组中的值和？开发者社区

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<form onchange="reload()">
  <h2>Input:</h2>
  <input type="number" id="val1" name="val1" value="3">
  <input type="number" id="val2" name="val2" value="4">
  <br><br>
  <h2>Output</h2>
  <input type="text" id="out" name="out" value="untouched by C++"><br>
</form>

Module = document.getElementById('module');
var msg = [];
msg.push(Number(document.getElementById('val1').value));
msg.push(Number(document.getElementById('val2').value));

Module.postMessage(msg);

virtual void HandleMessage(const pp::Var& var_message) {
  std::string message = var_message.AsString();
  pp::Var var_reply = pp::Var(message);
  PostMessage(var_reply);
}

virtual void HandleMessage(const pp::Var& var_message) {
  pp::Var var_reply =  var_message[0] + var_messgae[1]; // I expect this to be 3+4=7
  PostMessage(var_reply);
}

values = {
        "val1": Number(document.getElementById('val1').value),
        "val2": Number(document.getElementById('val2').value)
msg = JSON.stringify(values);
Module.postMessage(msg);

#include <sstream>
#include "picojson.h"
using namespace std;

virtual void HandleMessage(const pp::Var& var_message) {
        picojson::value v;
        // pass the message that was sent from JavaScript as a string
        // var_message.AsString() will be in form "{\"val1\":4,\"val2\":4}");
        // and convert it to istringstream
        istringstream iss2((string)var_message.AsString());
        // parse iss2 and extract the values val1 and val2
        string err = picojson::parse(v, iss2);
        int val1 = (int)v.get("val1").get<double>();
        int val2 = (int)v.get("val2").get<double>();
        // finally send the message and you'll see the sum in the JavaScript
        PostMessage( val1 + val2 );
  }

virtual void HandleMessage(const pp::Var& var_message) {
  if (!var_message.is_array()) return;
  pp::VarArray array(var_message);
  // Do some stuff with the array...
  uint32_t length = array.GetLength();
  double sum = 0;
  for (uint32_t i = 0; i < length; ++i) {
     pp::Var element = array.Get(i);
     if (element.is_number()) {
       sum += element.AsDouble();

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