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javascript - Why does window.onbeforeunload have console.log() not appear on the browser console?

window.onbeforeunload=function(){
  console.log("为啥不能运行");//这个为什么不出现控制台呢？
   return ;
}
我想大声告诉你我想大声告诉你2858 days ago471

reply all(2)I'll reply

  • 黄舟

    黄舟2017-05-19 10:34:10

    window.onbeforeunload=function(e){
  e.returnValue = 'something'
  console.log("为啥不能运行");
  return ;
}

    You must bind a value to the returnValue attribute of the event, otherwise the browser will be closed directly and you will not be able to see the console output

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  • 世界只因有你

    世界只因有你2017-05-19 10:34:10

    <body onbeforeunload="return ''">

http://www.runoob.com/jsref/event-onbeforeunload.html

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