Vanilla javascript Trap Focus in modal (accessibility tabbing )
问题 This should be pretty simple but for some reason it isn't working, I'm getting the proper console.logs at the right time, but the focus isn't going to the correct place, please refer to my jsfiddle https://jsfiddle.net/bqt0np9d/ function checkTabPress(e) { "use strict"; // pick passed event of global event object e = e || event; if (e.keyCode === 9) { if (e.shiftKey) { console.log('back tab pressed'); firstItem.onblur=function(){ console.log('last a focus left'); lastItem.focus(); }; e