用JavaScript获取输入的特殊字符
Web开发时可能经常会用到在keyPress时获得输入的字符。String.fromCharCode()可以来实现这个，不过这个函数在你使用Shift键来输入特殊字符时就不管用了，需要改造一下，这个帖子给出了改造的方法，经测试在各种主流浏览器均正常。
<html> <head> <title >mapKeyPressToActualCharacter test</title> <script language="javascript" type="text/javascript"> function onKeyPress() { var e = window.event || e; var keyCode = e.keyCode; if (keyCode == 8) { this.criteria.value = this.criteria.value.substring( 0, this.criteria.value.length - 1); } else { this.criteria.value += mapKeyPressToActualCharacter(event.shiftKey, keyCode); } } function mapKeyPressToActualCharacter(isShiftKey, characterCode) { if (characterCode === 27 || characterCode === 8 || characterCode === 9 || characterCode === 20 || characterCode === 16 || characterCode === 17 || characterCode === 91 || characterCode === 13 || characterCode === 92 || characterCode === 18) { return false; } if (typeof isShiftKey != "boolean" || typeof characterCode != "number") { return false; } var characterMap = []; characterMap[192] = "~"; characterMap[49] = "!"; characterMap[50] = "@"; characterMap[51] = "#"; characterMap[52] = "$"; characterMap[53] = "%"; characterMap[54] = "^"; characterMap[55] = "&"; characterMap[56] = "*"; characterMap[57] = "("; characterMap[48] = ")"; characterMap[109] = "_"; characterMap[107] = "+"; characterMap[219] = "{"; characterMap[221] = "}"; characterMap[220] = "|"; characterMap[59] = ":"; characterMap[222] = "\""; characterMap[188] = "<"; characterMap[190] = ">"; characterMap[191] = "?"; characterMap[32] = " "; var character = ""; if (isShiftKey) { if (characterCode >= 65 && characterCode <= 90) { character = String.fromCharCode(characterCode); } else { character = characterMap[characterCode]; } } else { if (characterCode >= 65 && characterCode <= 90) { character = String.fromCharCode(characterCode).toLowerCase(); } else { character = String.fromCharCode(characterCode); } } return character; } </script> </head> <body> <input name="test" type="text" onkeypress="onKeyPress();"/> </body> </html>
测试结果截图，在Firefox, Chrome and IE.和Safari下均通过：
