1.文本框只能輸入數字代碼(小數點也不能輸入)
<input onkeyup="this.value=this.value.replace(/D/g,'')" onafterpaste="this.value=this.value.replace(/D/g,'')">javascript
2.只能輸入數字,能輸小數點.
<input onkeyup="value=value.replace(/[^\d.]/g,'')" onafterpaste="this.value=this.value.replace(/[^\d.]/g,'')">
<input name=txt1 onchange="if(/D/.test(this.value)){alert('只能輸入數字');this.value='';}">java
3.數字和小數點方法二
<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(/^.$/))this.value=0;this.o_value=this.value}">this
4.只能輸入字母和漢字
<input onkeyup="value=value.replace(/[d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[d]/g,''))" maxlength=10 name="Numbers">spa
5.只能輸入英文字母和數字,不能輸入中文
<input onkeyup="value=value.replace(/[^w./]/ig,'')">ip
6.只能輸入數字和英文<font color="Red">chun</font>
<input onKeyUp="value=value.replace(/[^d|chun]/g,'')">get
7.小數點後只能有最多兩位(數字,中文均可輸入),不能輸入字母和運算符號:
<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /.dd$/.test(value))event.returnValue=false">input
8.小數點後只能有最多兩位(數字,字母,中文均可輸入),能夠輸入運算符號:
<input onkeyup="this.value=this.value.replace(/^(-)*(d+).(dd).*$/,'$1$2.$3')">string
只能是數字和小數點和加減乘際it
9.只能輸入數字、小數點、負數io
<input name="input" type="text" onkeyup="JHshNumberText(this)" id="title">
<br>
<script language="javascript" type="text/javascript">
function JHshNumberText(a)
{
var fa="";
if(a.value.substring(0,1)=="-")
fa="-";
var str=(a.value.replace(/[^0-9.]/g,'')).replace(/[.][0-9]*[.]/, '.');
if (str.substring(0,1)==".")
str="0"+str;
a.value=fa+str;
}</script>