js转全角为半角

全角与半角符号比较-ASCII
  
ASCII 全角字符 Unicode 半角字符 Unicode
0x20 " "空格 U+3000 " "空格 U+0020
0x21 ! U+ff01 ! U+0021
0x22 " U+ff02 " U+0022
0x23 # U+ff03 # U+0023
0x24 $ U+ff04 $ U+0024
0x25 % U+ff05 % U+0025
0x26 & U+ff06 & U+0026
0x27 ' U+ff07 ' U+0027
0x28 ( U+ff08 ( U+0028
0x29 ) U+ff09 ) U+0029
0x2a * U+ff0a * U+002a
0x2b + U+ff0b + U+002b
0x2c , U+ff0c , U+002c
0x2d - U+ff0d - U+002d
0x2e . U+ff0e . U+002e
0x2f / U+ff0f / U+002f
0x30 0 U+ff10 0 U+0030
0x31 1 U+ff11 1 U+0031
0x32 2 U+ff12 2 U+0032
0x33 3 U+ff13 3 U+0033
0x34 4 U+ff14 4 U+0034
0x35 5 U+ff15 5 U+0035
0x36 6 U+ff16 6 U+0036
0x37 7 U+ff17 7 U+0037
0x38 8 U+ff18 8 U+0038
0x39 9 U+ff19 9 U+0039
0x3a : U+ff1a : U+003a
0x3b ; U+ff1b ; U+003b
0x3c < U+ff1c < U+003c
0x3d = U+ff1d = U+003d
0x3e > U+ff1e > U+003e
0x3f ? U+ff1f ? U+003f
0x40 @ U+ff20 @ U+0040
0x41 A U+ff21 A U+0041
0x42 B U+ff22 B U+0042
0x43 C U+ff23 C U+0043
0x44 D U+ff24 D U+0044
0x45 E U+ff25 E U+0045
0x46 F U+ff26 F U+0046
0x47 G U+ff27 G U+0047
0x48 H U+ff28 H U+0048
0x49 I U+ff29 I U+0049
0x4a J U+ff2a J U+004a
0x4b K U+ff2b K U+004b
0x4c L U+ff2c L U+004c
0x4d M U+ff2d M U+004d
0x4e N U+ff2e N U+004e
0x4f O U+ff2f O U+004f
0x50 P U+ff30 P U+0050
0x51 Q U+ff31 Q U+0051
0x52 R U+ff32 R U+0052
0x53 S U+ff33 S U+0053
0x54 T U+ff34 T U+0054
0x55 U U+ff35 U U+0055
0x56 V U+ff36 V U+0056
0x57 W U+ff37 W U+0057
0x58 S U+ff38 X U+0058
0x59 Y U+ff39 Y U+0059
0x5a Z U+ff3a Z U+005a
0x5b [ U+ff3b [ U+005b
0x5c \ U+ff3c \ U+005c
0x5d ] U+ff3d ] U+005d
0x5e ^ U+ff3e ^ U+005e
0x5f _ U+ff3f _ U+005f
0x60 ` U+ff40 ` U+0060
0x61 a U+ff41 a U+0061
0x62 b U+ff42 b U+0062
0x63 c U+ff43 c U+0063
0x64 d U+ff44 d U+0064
0x65 e U+ff45 e U+0065
0x66 f U+ff46 f U+0066
0x67 g U+ff47 g U+0067
0x68 h U+ff48 h U+0068
0x69 i U+ff49 i U+0069
0x6a j U+ff4a j U+006a
0x6b k U+ff4b k U+006b
0x6c l U+ff4c l U+006c
0x6d m U+ff4d m U+006d
0x6e n U+ff4e n U+006e
0x6f o U+ff4f o U+006f
0x70 p U+ff50 p U+0070
0x71 q U+ff51 q U+0071
0x72 r U+ff52 r U+0072
0x73 s U+ff53 s U+0073
0x74 t U+ff54 t U+0074
0x75 u U+ff55 u U+0075
0x76 v U+ff56 v U+0076
0x77 w U+ff57 w U+0077
0x78 x U+ff58 x U+0078
0x79 y U+ff59 y U+0079
0x7a z U+ff5a z U+007a
0x7b { U+ff5b { U+007b
0x7c | U+ff5c | U+007c
0x7d } U+ff5d } U+007d
0x7e ~ U+ff5e ~ U+007e

用JS把全角转换成半角的函数
 <input name="input" type="text" id="input" onkeyup="FtoH(this);" style="width:100%;height:100%;"/>
 <SCRIPT>
 function FtoH(obj){
  var str=obj.value;
  var result="";
  for (var i = 0; i < str.length; i++){
   if (str.charCodeAt(i)==12288){
    result+= String.fromCharCode(str.charCodeAt(i)-12256);
    continue;
   }
   if (str.charCodeAt(i)>65280 && str.charCodeAt(i)<65375) result+= String.fromCharCode(str.charCodeAt(i)-65248);
   else result+= String.fromCharCode(str.charCodeAt(i));
  }
  obj.value=result;
 }
 </SCRIPT>

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