Javascript 检测是否有铬氯化钠

有没有办法检测当前浏览器上是否有NaCl

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在一些非chrome浏览器上检查

chrome.app.isInstalled

似乎会变成假阳性

您可以检查浏览器是否处理mime类型。例如：

navigator.mimeTypes['application/x-nacl'] !== undefined.

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类似地，对于PNaCl，您可以检查

'application/x-PNaCl'

您可以检查Chrome和特定版本的Chrome，如下所示：

var have_nacl = false;
var have_pnacl = false;

var index = navigator.userAgent.indexOf('Chrome');
if (index != -1) {
  var version = parseFloat(navigator.userAgent.substring(index + 7));

  if (31 <= version) have_pnacl = true;
  if (14 <= version) have_nacl = true;
}

var watchdog;
var watchdog_time;

function watchdog_timeout() {
  alert('NaCl module failed to load');
}

function watchdog_clear() {
  clearTimeout(watchdog);
}

function watchdog_set(time) {
  watchdog_time = time;
  watchdog = setTimeout(watchdog_timeout, time);
}

watchdog_set(5000); // Timeout in 5 sec

var module = document.getElementById('module'); // Use your module's ID
module.addEventListener('load', function () {
  watchdog_clear();
  alert('NaCl module loaded');
}, true);

// Inject the module, where module.nmf is your NMF file.
module.innerHTML = '<embed src="module.nmf" type="application/x-nacl"/>';

<div id="module"></div>

function watchdog_extend() {
  watchdog_clear();
  watchdog_set(watchdog_time);
}

module.addEventListener('loadstart', watchdog_extend, true);
module.addEventListener('progress', watchdog_extend, true);