1.文本框只能輸入數(shù)字代碼(小數(shù)點也不能輸入)
<input ōnkeyup="this.value=this.value.replace(/\D/g,'''')" ōnafterpaste="this.value=this.value.replace(/\D/g,'''')">

2.只能輸入數(shù)字,能輸小數(shù)點.
<input ōnkeyup="if(isNaN(value))execCommand(''undo'')" ōnafterpaste="if(isNaN(value))execCommand(''undo'')">
<input name=txt1 ōnchange="if(/\D/.test(this.value)){alert(''只能輸入數(shù)字'');this.value='''';}">

3.數(shù)字和小數(shù)點方法二
<input type=text t_value="" o_value="" ōnkeypress="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" ōnkeyup="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" ōnblur="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 ōnkeyup="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 ōnkeyup="value=value.replace(/[^\w\.\/]/ig,'''')">

6.只能輸入數(shù)字和英文<font color="Red">chun</font>
<input ōnKeyUp="value=value.replace(/[^\d|chun]/g,'''')">

7.小數(shù)點后只能有最多兩位(數(shù)字,中文都可輸入),不能輸入字母和運算符號:
<input ōnKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">

8.小數(shù)點后只能有最多兩位(數(shù)字,字母,中文都可輸入),可以輸入運算符號:
<input ōnkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,''$1$2.$3'')">