輸入框 js正則判斷輸入

1.文本框只能輸入數(shù)字代碼(小數(shù)點(diǎn)也不能輸入) 
<input onkeyup="this.value=this.value.replace(/D/g,'')" onafterpaste="this.value=this.value.replace(/D/g,'')"> 
2.只能輸入數(shù)字,能輸小數(shù)點(diǎn). 
<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')"> 
<input name=txt1 onchange="if(/D/.test(this.value)){alert('只能輸入數(shù)字');this.value='';}"> 
3.數(shù)字和小數(shù)點(diǎn)方法二 
<input type=text t_value="" o_value="" onkeypress="if(!this.value.match(/^[+-]?d*?.?d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[+-]?d+(?:.d+)?)?$/))this.o_value=this.value" onkeyup="if(!this.value.match(/^[+-]?d*?.?d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[+-]?d+(?:.d+)?)?$/))this.o_value=this.value" onblur="if(!this.value.match(/^(?:[+-]?d+(?:.d+)?|.d*?)?$/))this.value=this.o_value;else{if(this.value.match(/^.d+$/))this.value=0+this.value;if(this.value.match(/^.$/))this.value=0;this.o_value=this.value}">
4.只能輸入字母和漢字 
<input onkeyup="value=value.replace(/[d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[d]/g,''))" maxlength=10 name="Numbers"> 
5.只能輸入英文字母和數(shù)字,不能輸入中文 
<input onkeyup="value=value.replace(/[^w./]/ig,'')"> 
6.只能輸入數(shù)字和英文<font color="Red">chun</font> 
<input onKeyUp="value=value.replace(/[^d|chun]/g,'')"> 
7.小數(shù)點(diǎn)后只能有最多兩位(數(shù)字,中文都可輸入),不能輸入字母和運(yùn)算符號(hào): 
<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /.dd$/.test(value))event.returnValue=false"> 
8.小數(shù)點(diǎn)后只能有最多兩位(數(shù)字,字母,中文都可輸入),可以輸入運(yùn)算符號(hào):

<input onkeyup="this.value=this.value.replace(/^(-)*(d+).(dd).*$/,'$1$2.$3')">

禁止特殊字符：

onKeyPress="if(event.keyCode < 45 || event.keyCode > 57 ) event.returnValue = false;"

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