Detailed introduction to the html input box that can only enter numbers and alphanumeric combinations

JS判断只能是数字和小数点

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,&#39;&#39;)" onafterpaste="this.value=this.value.replace(/\D/g,&#39;&#39;)">

2.只能输入数字,能输小数点.

<input onkeyup="if(isNaN(value))execCommand(&#39;undo&#39;)"
onafterpaste="if(isNaN(value))execCommand(&#39;undo&#39;)">
<input name=txt1 onchange="if(/\D/.test(this.value)){alert(&#39;只能输入数字&#39;);this.value=&#39;&#39;;}">

3.数字和小数点方法二

<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}">

4.只能输入字母和汉字

<input onkeyup="value=value.replace(/[\d]/g,&#39;&#39;) 
"onbeforepaste="clipboardData.setData(&#39;text&#39;,clipboardData.getData(&#39;text&#39;).replace(/[\d]/g,&#39;&#39;))" 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,&#39;&#39;)">

6.只能输入数字和英文chun

<input onKeyUp="value=value.replace(/[^\d|chun]/g,&#39;&#39;)">

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).*$/,&#39;$1$2.$3&#39;)">

输入中文:  

<input type="text" onkeyup="this.value=this.value.replace(/[^\u4e00-\u9fa5]/g,&#39;&#39;)">

输入数字:  

<input type="text" onkeyup="this.value=this.value.replace(/\D/g,&#39;&#39;)">

输入英文:  

<input type="text" onkeyup="this.value=this.value.replace(/[^a-zA-Z]/g,&#39;&#39;)">

三个合在一起  

<input onkeyup="value=value.replace(/[^\w\u4E00-\u9FA5]/g, &#39;&#39;)">

只输入数字和字母  

<input class=input maxLength=12 size=15 name=username id="username" onKeyUp="value=value.replace(/[\W]/g,&#39;&#39;)">

除了英文的标点符号以为 其他的人都可以中文，英文字母，数字，中文标点

<input type="text" onkeyup="this.value=this.value.replace(/^[^!@#$%^&*()-=+]/g,&#39;&#39;)">

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