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  • onkeyup+onafterpaste 只能输入数字和小数点

    JS判断只能是数字和小数点
    2007-09-15 10:05

    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,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')">

    2.只能输入数字,能输小数点.
    <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 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,'') "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')">

    只能是数字和小数点和加减乘際

    onkeypress="return event.keyCode>=4&&event.keyCode<=57"

    引自:http://apps.hi.baidu.com/share/detail/6347452

    爱过知情重,醉过知酒浓
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  • 原文地址:https://www.cnblogs.com/huanhuan86/p/2372892.html
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