2

简单的webWorker

 2 years ago
source link: https://segmentfault.com/a/1190000040854074
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简单的webWorker

发布于 今天 14:46 
<body>
    <h1>Web<br>Workers<br>basic<br>example</h1>
    <div class="controls" tabindex="0">
      <form>
        <div>
          <label for="number1">Multiply number 1: </label>    
          <input type="text" id="number1" value="0">
        </div>
        <div>
          <label for="number2">Multiply number 2: </label>   
          <input type="text" id="number2" value="0">
        </div>
      </form>
      <p class="result">Result: 0</p>
    </div>
    <script src="main.js"></script>
  </body>

main.js

const first = document.querySelector('#number1');
const second = document.querySelector('#number2');

const result = document.querySelector('.result');

if (window.Worker) {
    const myWorker = new Worker("worker.js");

    first.onchange = function() {
      myWorker.postMessage([first.value, second.value]);
      console.log('Message posted to worker');
    }

    second.onchange = function() {
      myWorker.postMessage([first.value, second.value]);
      console.log('Message posted to worker');
    }

    myWorker.onmessage = function(e) {
        result.textContent = e.data;
        console.log('Message received from worker');
    }
} else {
    console.log('Your browser doesn\'t support web workers.')
}

worker.js

onmessage = function(e) {
  console.log('Worker: Message received from main script');
  const result = e.data[0] * e.data[1];
  if (isNaN(result)) {
    postMessage('Please write two numbers');
  } else {
    const workerResult = 'Result: ' + result;
    console.log('Worker: Posting message back to main script');
    postMessage(workerResult);
  }
}

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