JavaScript 全角转半角部分

<script language=javascript>
//全角空格为12288，半角空格为32
//其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
//document.write((65281).toString(16)+"----"+(65374).toString(16)+"----"+(12288).toString(16));
String.prototype.dbc2sbc = function ()
{
return this.replace(/[\uff01-\uff5e]/g,function(a){return String.fromCharCode(a.charCodeAt(0)-65248);}).replace(/\u3000/g," ");
}
document.write("ＡＢＣ　１２３，我们都是好朋友".dbc2sbc());
</script>

<input type="text" onfocus="this.style.imeMode='disabled'" />

<input
onkeypress="var k=event.keyCode; return k>=48&&k<=57"
onpaste="return !clipboardData.getData('text').match(/\D/)"
ondragenter="return false" style="ime-mode:Disabled"
>