<input type="text" name="textfield" onKeyPress="javascript:alert(event.keyCode);return flase">
1.文本框只能輸入數(shù)字代碼(小數(shù)點(diǎn)也不能輸入)
<input onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')">
2.只能輸入數(shù)字,能輸小數(shù)點(diǎn).
<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">
<input name=txt1 onchange="if(/\D/.test(this.value)){alert('只能輸入數(shù)字');this.value='';}">
3.數(shù)字和小數(shù)點(diǎn)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(/^\.$/))this.value=0;this.o_value=this.value}">
4.只能輸入字母和漢字
<input onkeyup="value=value.replace(/[\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers">
5.只能輸入英文字母和數(shù)字,不能輸入中文
<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
6.只能輸入數(shù)字和英文<font color="Red">chun</font>
<input onKeyUp="value=value.replace(/[^\d|chun]/g,'')">
7.小數(shù)點(diǎn)后只能有最多兩位(數(shù)字,中文都可輸入),不能輸入字母和運(yùn)算符號:
<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">
8.小數(shù)點(diǎn)后只能有最多兩位(數(shù)字,字母,中文都可輸入),可以輸入運(yùn)算符號:
<input onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">

<input onkeyup="value=value.replace(/[^\d\.]/g,'')">
<input type=text onkeypress="return event.keyCode>=65" style="ime-mode:disabled">

<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}">

<input onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')">
or
<input name=txt1 onchange="if(/\D/.test(this.value)){alert('只能輸入數(shù)字');this.value='';}">
or
<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">


限制文本框只能輸入數(shù)字包括小數(shù)點(diǎn)
<input onkeyup="value=value.replace(/[^\d\.]/g,'')">
有關(guān)正則表達(dá)式 1.只能輸入數(shù)字和英文的： <input onkeyup="value=value.replace(/[\W]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" ID="Text1" NAME="Text1">
2.只能輸入數(shù)字的： <input onkeyup="value=value.replace(/[^\d]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" ID="Text2" NAME="Text2">
3.只能輸入全角的： <input onkeyup="value=value.replace(/[^\uFF00-\uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\uFF00-\uFFFF]/g,''))" ID="Text3" NAME="Text3">
4.只能輸入漢字的： <input onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))" ID="Text4" NAME="Text4">
移到輸入框時(shí)自動選擇: <input type="text" id="text1" name="text1" value="輸入檢索關(guān)鍵字" onclick="javascript:this.form.text1.focus();this.form.text1.select();" maxlength="15" />

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