Analysis of how to use js to determine that only numbers, letters, etc. can be entered for verification (summary)_javascript skills

JS判断只能是数字和小数点
0.不能输入中文
1）
2）<script><br>function chkIt(frm){<br>if (frm.n1.value.length>0&&frm.n1.value.match(/[\x01-\xFF]*/)==false){<br>alert(‘n1不能输入中文！')<br>frm.n1.focus();<br>return false;<br>}<br>}<br></script>

1.文本框只能输入数字代码(小数点也不能输入)

2.只能输入数字,能输小数点.


3.数字和小数点方法二

4.只能输入字母和汉字

5.只能输入英文字母和数字,不能输入中文

6.只能输入数字和英文chun

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:
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:


禁止特殊字符：

onKeyPress=”if(event.keyCode < 45 || event.keyCode > 57 ) event.returnValue = false;”

只能输入汉字：

style=”ime-mode:disabled”禁止汉字输入法

只能输入数字：

只能输入英文和数字：

控制输入框只能输入文字或数字，也可以不允许输入特殊字符
这里不允许输入如下字符: (像 ^&* 等)

32 && event.keyCode < 48) || (event.keyCode > 57 && event.keyCode < 65) || (event.keyCode > 90 && event.keyCode < 97)) event.returnValue = false;”><br>只禁止空格输入<br>onkeyup=”value=value.replace(//s/g,”)”<br>onkeydown=”if(event.keyCode==32) return false”<br>只能输入中文和英文：<br>onkeyup=”value=value.replace(/[^/a-zA-Z/u4E00-/u9FA5]/g,”)” onbeforepaste=”clipboardData.setData(‘text',clipboardData.getData(‘text').replace(/[^/a-zA-Z/u4E00-/u9FA5]/g,”))”</p> <p>不允许输入特殊字符和空格:<br><input id=”code” onkeypress=”return ValidateSpecialCharacter();” onblur=”validate(this)”/></p> <p>————————————————————————————————————————<br>不能为空<br><input onblur=”if(this.value.replace(/^ +| +$/g,”)==”)alert(‘不能为空!')”><br>判断字符由字母和数字，下划线,点号组成.且开头的只能是下划线和字母<br>/^([a-zA-z_]{1})([\w]*)$/g.test(str)<br>只能输入数字<br><input name=”text” type=”text” id=”NewPage” onKeyUp=”value=value.replace(/\D/g,”)” onafterpaste=”value=value.replace(/\D/g,”)” ><br>只能输入中文<br><input type=”text” onkeyup=”value=value.replace(/[^\u4E00-\u9FA5]/g,”)”><br>只能输入英文<br><input type=”text” onkeyup=”value=value.replace(/[^\a-\z\A-\Z]/g,”)”><br><input type=”text” onkeyup=”value=value.replace(/[^a-zA-Z]/g,”)”><br>——————————————————————————————————————–<br>1.文本框只能输入数字代码(小数点也不能输入)<br><input onkeyup=”this.value=this.value.replace(//D/g,”)” onafterpaste=”this.value=this.value.replace(//D/g,”)”><br>2.只能输入数字,能输小数点.<br><input onkeyup=”if(isNaN(value))execCommand(‘undo')” onafterpaste=”if(isNaN(value))execCommand(‘undo')”><br><input name=txt1 onchange=”if(//D/.test(this.value)){alert(‘只能输入数字');this.value=”;}”><br>3.数字和小数点方法二<br><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(/^/.$/))this.value=0;this.o_value=this.value}”><br>4.只能输入字母和汉字<br><input onkeyup=”value=value.replace(/[/d]/g,”) “onbeforepaste=”clipboardData.setData(‘text',clipboardData.getData(‘text').replace(/[/d]/g,”))” maxlength=10 name=”Numbers”><br>5.只能输入英文字母和数字,不能输入中文<br><input onkeyup=”value=value.replace(/[^/w/.//]/ig,”)”><br>6.只能输入数字和英文<font color=”Red”>chun</font><br><input onKeyUp=”value=value.replace(/[^/d|chun]/g,”)”><br>7.小数点后只能有最多两位(数字,中文都可输入),不能输入字母和运算符号:<br><input onKeyPress=”if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || //./d/d$/.test(value))event.returnValue=false”><br>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:<br><input onkeyup=”this.value=this.value.replace(/^(/-)*(/d+)/.(/d/d).*$/,'$1$2.$3′)”></p> <p>只能输入中文、英文、数字、@符号和.符号<br><input type=”text” onkeyup=”value=value.replace(/[^\a-\z\A-\Z0-9\u4E00-\u9FA5\@\.]/g,”)”><br>只允许输入英文，且不能粘贴也无法弹出粘贴菜单<br><input type=”text” onkeyup=”value=value.replace(/[^\a-\z\A-\Z]/g,”)” onkeydown=”fncKeyStop(event)” onpaste=”return false” oncontextmenu = “return false”/><br>只能输入数字和点号(注意:在[^\d\.]里的d不能写成大写D,否则就变成除了数字以外的所有字符)<br><input name=”price” type=”text” size=”8″ maxlength=”8″ onkeyup=”value=value.replace(/[^\d\.]/g,”)” ><br>总而言之:先在<input>里输入onkeyup=”value=value.replace(/[^\X]/g,”)” 然后在(/[\X]/g,”)里的X换成你想输入的代码就可以了<br>中文：u4E00-u9FA5<br>数字：d、0-9<br>英文：a-z、A-Z<br>其它符号@,点或其它符号.也可以多个,用隔开就行了.<br>例如:<br>中、英文和数字加@符号加点符号：a-\z\A-\Z0-9\u4E00-\u9FA5\@\.<br>若 想在文本框里不能右键弹出菜单和不能粘贴进复制的信息的话就要在<input>里输入 onKeyDown=”fncKeyStop(event)” onpaste=”return false” oncontextmenu=”return false;”<br>—————————————————————————————————————————————</p> <p>其一，只允许输入数字和小数点。<br><input onKeypress=”return (/[/d.]/.test(String.fromCharCode(event.keyCode)))” style=”ime-mode:Disabled”></p> <p>Second, the judgment is more detailed, and even 22..2 can be judged without counting it as a number</p> <p><script><br>function check(){<br>if (isNaN(tt.value))<br>{alert("Illegal character!");<br>tt.value=””; }<br>}<br></script><br><input type=”text” name=”tt” onkeyup=”check();”></p> <p>Third, only integers are allowed. In fact, it is entirely possible to make some restrictions by drawing inferences based on Article 3. </p> <p><script language=javascript><br>function onlyNum()<br>{<br>if(!(event.keyCode==46)&&!(event.keyCode==8)&&!(event. keyCode==37)&&!(event.keyCode==39))<br>if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105 )))<br>event.returnValue=false;<br>}<br></script><input onkeydown=”onlyNum();” style=”ime-mode:Disabled><br>Conclusion, in fact </p> <p>style=”ime-mode:Disabled<br>This sentence is more practical. It means to turn off the input method. This saves some people from having to open the full-width input method to input numbers, but the result is that the input cannot come in and come to you to cry and wipe away tears. It’s your fault for poor design. </p> <p>Only numbers are allowed<br><input name=”username” type=”text” onkeyup=”value=this.value.replace(//D /g,”)”></p> <p>Only English letters, numbers and underscores are allowed to be entered (the following two methods are available)<br><input name=”userna One, only numbers and decimal points are allowed to be entered.<BR><input onKeypress=”return ( /[/d.]/.test(String.fromCharCode(event.keyCode)))” style=”ime-mode:Disabled”></p> <p>Second, the judgment is more detailed, and even 22..2 can be judged without counting it as a number</p> <p><script><br>function check(){<br>if (isNaN(tt.value))<br>{alert("Illegal character!");<br>tt.value=””; }<br>}<br></script><br><input type=”text” name=”tt” onkeyup=”check();”></p> <p>Third, only integers are allowed. In fact, it is entirely possible to make some restrictions by drawing inferences based on Article 3. </p> <p><script language=javascript><br>function onlyNum()<br>{<br>if(!(event.keyCode==46)&&!(event.keyCode==8)&&!(event. keyCode==37)&&!(event.keyCode==39))<br>if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105 )))<br>event.returnValue=false;<br>}<br></script><input onkeydown=”onlyNum();” style=”ime-mode:Disabled><br>Conclusion, in fact </p> <p>style=”ime-mode:Disabled<br>This sentence is more practical. It means to turn off the input method. This saves some people from having to open the full-width input method to input numbers, but the result is that the input cannot come in and come to you to cry and wipe away tears. It’s your fault for poor design. </p> <p>Only numbers are allowed<br><input name=”username” type=”text” onkeyup=”value=this.value.replace(//D /g,”)”></p> <p>Only English letters, numbers and underscores are allowed to be entered (the following two methods are available)<br><input name=”username” type=”text” style=”ime-mode:disabled”><br>< ;input name=”username” type=”text” onkeyup=”value=value.replace(/[^/w/.//]/ig,”)”></p> <p>Only English letters, numbers and &=@<br><input name=”username” type=”text” onkeyup=”value=value.replace(/[^/w=@&]|_ /ig,")"></p> <p>Only Chinese characters are allowed to be entered<br><input name=”username” type=”text” onkeyup=”value=value.replace(/[^/u4E00-/u9FA5]/g,”)”><br>me” type=”text” style=”ime-mode:disabled”><br><input name=”username” type=”text” onkeyup=”value=value.replace(/[^/w /.//]/ig,”)”></p> <p>Only English letters, numbers and &=@<br><input name=”username” type=”text” onkeyup=”value=value.replace(/[^/w=@&]|_ /ig,")"></p> <p>Only Chinese characters are allowed to be entered<br><input name=”username” type=”text” onkeyup=”value=value.replace(/[^/u4E00-/u9FA5]/g,”)”><br></p></div><div class="nphpQianMsg"><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement：</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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