Script to use JavaScript to check whether the Caps Lock is on_javascript skills

When the user encounters a page that requires them to enter a password, are there any capital letters in the password? Is Caps Lock on? Wouldn't it be better if we could give users hints?

The following sample code gives the method, and the necessary instructions are commented in the code.
Question knowledge points: event.keyCode and event.shiftKey

Code

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Original text: http ://www.blogjava.net/majianan/archive/2007/02/01/97284.html <script> function detectCapsLock(e){ valueCapsLock = e.keyCode ? e.keyCode:e.which; // Caps Lock　是否打开 valueShift = e.shiftKey ? e.shiftKey:((valueCapsLock == 16 ) ? true : false ); // shift键是否按住 if (((valueCapsLock >= 65 && valueCapsLock <= 90 ) && ! valueShift) // Caps Lock 打开，并且 shift键没有按住 || ((valueCapsLock >= 97 && valueCapsLock <= 122 ) && valueShift)) // Caps Lock 打开，并且按住 shift键 document.getElementById('capStatus').style.visibility = 'visible'; else document.getElementById('capStatus').style.visibility = 'hidden'; /* javascript中keyCode代码对应表 event.keyCode=32 空格 event.keyCode=13 回车 event.keyCode=27 Esc event.keyCode=16) Shift event.keyCode=17) Ctrl event.keyCode=18) Alt */ } </script>