<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body>1.文本框只能输入数字代码(小数点也不能输入)<input οnkeyup="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 οnkeyup="if(isNaN(
value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')"><input name=txt1 οnchange="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" t_value="" o_value="" οnkeypress="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" οnkeyup="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" οnblur="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(/^\.$/))this.
value=0;this.
o_value=this.
value}">4.只能输入字母和汉字<input οnkeyup="
value=
value.replace(/[\d]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers"> 5.只能输入英文字母和数字,不能输入中文<input οnkeyup="
value=
value.replace(/[^\w\.\/]/ig,'')">6.只能输入数字和英文<font color="Red">chun</font><input onKeyUp="
value=
value.replace(/[^\d|chun]/g,'')">7.小数点后只能有最多两位(数字,中文都可输入),不能输入字母和运算符号:<input onKeyPress="if((
event.
keyCode<48 ||
event.
keyCode>57) &&
event.
keyCode!=46 || /\.\d\d$/.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 οnkeyup="this.
value=this.
value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">9.只能是数字和小数点和加减乘際<input οnkeypress="return
event.
keyCode>=4 &&
event.
keyCode<=57" /></body></html>
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