1.文本框只能输入数字代码(小数点也不能输入)
<input?onkeyup="this.value=this.value.replace(/\D/g,'')"?onafterpaste="this.value=this.value.replace(/\D/g,'')">
2.只能输入数字,能输小数点.
<input?type="text"?size="12"?onkeyup="this.value=this.value.replace(/[^\d\.]+?/g,'')"?/>
<input?onkeyup="if(isNaN(value))execCommand('undo')"?onafterpaste="if(isNaN(value))execCommand('undo')">
<input?name=txt1?onchange="if(/\D/.test(this.value)){alert('只能输入数字');this.value='';}">
3.数字和小数点方法二
<input?type=text?tvalue=""?ovalue=""?onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else?this.tvalue=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.ovalue=this.value"?onkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else?this.tvalue=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.ovalue=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(/^\.$/))this.value=0;this.ovalue=this.value}">
4.只能输入字母和汉字
<input?onkeyup="value=value.replace(/[\d]/g,'')?"onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))"?maxlength=10?name="Numbers">
5.只能输入英文字母和数字,不能输入中文
<input?onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
6.只能输入数字和英文<font?color="Red">chun</font>
<input?onKeyUp="value=value.replace(/[^\d|chun]/g,'')">
7.小数点后只能有最多两位(数字,中文都可输入),不能输入字母和运算符号:
<input?onKeyPress="if((event.keyCode<48?||?event.keyCode>57)?&&?event.keyCode!=46?||?/\.\d\d$/.test(value))event.returnValue=false">
8.小数点后只能有最多两位(数字,字母,中文都可输入),可以输入运算符号:
<input?onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">
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