动态加载JS

作者：Nick

function loadScript(url, callback) {
  var script = document.createElement("script");
  script.type = "text/";
  if (typeof(callback) != "undefined") {
    if (script.readyState) {
      script.onreadystatechange = function() {
        if (script.readyState == "loaded" || script.readyState == "complete") {
          script.onreadystatechange = null;
          callback();
        }
      };
    } else {
      script.onload = function() {
        callback();
      };
    }
  }
  script.src = url;
  document.body.appendChild(script);
}

转载自：https://juejin.im/post/5b62d02ee51d453467552dc9

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