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比如1.js，有可能会多次引入到页面。如何通过1.js自身的代码，防止引入多次？或者，在引入多次时，让第二次以及以后的引入代码不必执行？

9 years, 12 months ago

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爱上百合的狮子 9 years, 12 months ago

Answer 1

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a.js:


 !function(){
  if(window['a.js']) return;
  window['a.js'] = true;
  console.log('code here');
}();

answered 9 years, 12 months ago

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kanibep answered 9 years, 12 months ago