只读文本框内容,只能显示，不能修改
<input readonly value="只能显示，不能修改">
只能是中文(有闪动)
<input onkeyup="value=value.replace(/[ -~]/g,'')">
只能输入英文和数字(有闪动)
<input onkeyup="value=value.replace(/[\W]/g,'')"onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
只能是数字，整数(有闪动)
<input onkeyup="value=value.replace(/[^\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
只能是数字，整数(无闪动)
<input type="text"onkeypress='return /^\d$/.test(String.fromCharCode(event.keyCode||event.keycode||event.which))'oninput='this.value = this.value.replace(/\D+/g, "")'onpropertychange='if(!/\D+/.test(this.value)){return;};this.value=this.value.replace(/\D+/g, "")'onblur='this.value = this.value.replace(/\D+/g, "")'/>
只能输入数字和小数点、负数(有闪动)
<input type=text t_value="" o_value=""onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))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}">
js控制 只能输入数字、小数点、负数(有闪动)
<input name="input" type="text" onkeyup="JHshNumberText(this)" id="title"><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>
不能输入数字(有闪动)
<input onkeyup="value=value.replace(/[\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))"name="Numbers">
只能输入英文字母和数字,不能输入中文和符号(有闪动)
<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
只能输入数字和指定英文chun(有闪动)
<input onKeyUp="value=value.replace(/[^\d|chun]/g,'')">
