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<font color=”#DC143C” size=”4″>非法输入的两种报错处理：</font><br/>
只能输入数字（非法输入将弹出提示对话框）<input type=”text” name=”txt1″ οnchange=”if(/\D/.test(this.value)){alert(‘只能输入数字’);this.value=”;}” /><br/>
<font color=”#EE82EE” size=”4″>true:0|123|0123|… false:a|12c|1.|…</font><br/>
只能输入数字（非法输入将直接替换为空）<input οnkeyup=”this.value=this.value.replace(/\D/g,”)” type=”text” /><br/>
<font color=”#EE82EE” size=”4″>true:0|123|0123|… false:a|12c|1.|…</font><br/>
<font color=”#DC143C” size=”4″>后文中统一使用第二种（非法输入将直接替换为空）</font><br/><br/>
1.只能输入数字 <input οnkeyup=”value=value.replace(/\D/g,”)” type=”text” /><br/> <!– OR value=value.replace(/[^\d]/g,”) –>
<font color=”#EE82EE” size=”4″> true:0|123|0123|… false:a|12c|1.|…</font><br/>
2.只能输入数字和英文的 <input οnkeyup=”value=value.replace(/[\W]/g,”) ” type=”text” /><br/>
<font color=”#EE82EE” size=”4″>true:0|A|a|… false:-|a*|1.|…</font><br/>
3.只能输入中文的 <input οnkeyup=”value=value.replace(/[^\u4E00-\u9FA5]/g,”)” type=”text”/><br/>
<font color=”#EE82EE” size=”4″>true:哈哈哈|… false:a|12c|1.|…</font><br/>
4.只能输入大小写英文 <input οnkeyup=”value=value.replace(/[^\a-\z\A-\Z]/g,”)” type=”text” /><br/>
<font color=”#EE82EE” size=”4″>true:abc|ABC|… false:a1|a.|…</font><br/>
5.只能输入非负有理数 <input οnkeyup=”if(isNaN(value))execCommand(‘undo’)” type=”text” /><br/>
<font color=”#EE82EE” size=”4″> true:0.1|12|12.3|… false:.0|1.2.|a|…</font><br/>
6.只能输入负有理数 <input οnkeypress=”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” οnkeyup=”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” οnblur=”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(/^\.$/))this.value=0;this.o_value=this.value}” type=”text” /><br/>
<font color=”#EE82EE” size=”4″> true:+1.2|-1.2|0.12|… false:+-|0.1.|1+|…</font><br/>
7.不能输入数字 <input οnkeyup=”value=value.replace(/[\d]/g,”) ” type=”text” /> <br />
<font color=”#EE82EE” size=”4″> true:abc|+-*/?!|哈哈哈|… false:012|…</font><br/>
8.只能输入英文字母和数字 <input οnkeyup=”value=value.replace(/[^\w]/ig,”)” type=”text” /><br/>
<font color=”#EE82EE” size=”4″> true:abc|ABC|123|… false:+-|哈哈哈|./\?!|…</font><br/>
9.只能输入数字0 <input οnkeyup=”value=value.replace(/[^0]/g,”)” type=”text” /> <br/>
<font color=”#EE82EE” size=”4″> true:0|00|000|… false:1|+|s|…</font><br/>
10.除数字0以外均可输入 <input οnkeyup=”value=value.replace(/0/g,”)” type=”text” /> <br/>
<font color=”#EE82EE” size=”4″> true:abc|+-|456|… false:0</font><br/>
11.小数点后最多只能有两位数字（不能输入字母和运算符号） <input οnkeypress=”if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false” type=”text” /><br/>
<font color=”#EE82EE” size=”4″> true:123|0.12|.56|… false:0f|0.123|.f|…</font><br/>
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转载于:https://www.cnblogs.com/haw2106/p/7832524.html