Vue正则表达式限制input的输入范围

<a-input type="text" onkeyup="value=value.replace(正则表达式,'')"> 
如：
<a-input type="text" onkeyup="value=value.replace(/[^\w_]/g,'')"> 

<a-input onkeyup="value=value.replace(/\D/g,'')" onafterpaste="value=value.replace(/\D/g,'')"/>

<a-input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')"/>
或者：
<a-input onchange="if(/\D/.test(this.value)){alert('只能输入数字');this.value='';}"/>
或者：
<a-input type="text" 
         onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;ase this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value" 
        onkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;ase this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value"
      	onblur="if(!this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))this.value=this.o_value;ase{if(this.value.match(/^\.\d+$/))this.value=0+this.value;if(this.value.match(/^\.$/))this.value=0;this.o_value=this.value}"/>

<a-input onkeyup="value=value.replace(/[\d]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers"/>

<a-input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">

<a-input onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">