js判定不能输入某个字母或符号
οnkeydοwn=“ifevent.keyCode==32) return false”
字母和数字键的键码值keyCode)（左侧）
按键键码按键键码按键键码按键键码A65J74S83149B66K75T84250C67L76U85351D68M77V86452E69N78W87553F70O79X88654G71P80Y89755H72Q81Z90856I73R82048957
数字键盘上键的键码值（右侧）
按键键码按键键码按键键码0966102Enter1081977103-1092989104.1103999105/1114100*1065101+107
F键键码值
按键键码按键键码F1112F7118F2113F8119F3114F9120F4115F10121F5116F11122F6117F12123
控制键键码值keyCode)
按键键码按键键码按键键码按键键码BackSpace8Esc27Right Arrow39-_189Tab9Spacebar32Dw Arrow40.>190Clear12Page Up33Insert45/?191Enter13Page Down34Delete46`~192Shift16End35Num Lock144[{219Control17Home36;:186|220Alt18Left Arrow37=+187]}221Cape Lock20Up Arrow38,<188′”222
多媒体键码值
按键键码音量加175音量减174停止179静音173浏览器172邮件180搜索170收藏171