javascript限制只能输入英文字母和_和-中文(有效数字)
onkeyup="this.value=this.value.replace(/[^a-z_-]/g,'')" //限制只能输入英文字母和_和-
onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" //只能输入中文
onkeyup="if(isNaN(value)){alert('只能输入有效数字');execCommand('undo');}"//只能输入有效数字
onkeyup="if(!value.match(new RegExp('^[0-9]+$'))){alert('只能输入数字');this.value='';}"//只能输入整数
正则表达式
"^\\d+$" //非负整数(正整数 + 0)
"^[0-9]*[1-9][0-9]*$" //正整数
"^((-\\d+)|(0+))$" //非正整数(负整数 + 0)
"^-[0-9]*[1-9][0-9]*$" //负整数
"^-?\\d+$" //整数
"^\\d+(\\.\\d+)?$" //非负浮点数(正浮点数 + 0)
"^(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*))$" //正浮点数
"^((-\\d+(\\.\\d+)?)|(0+(\\.0+)?))$" //非正浮点数(负浮点数 + 0)
"^(-(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*)))$" //负浮点数
"^(-?\\d+)(\\.\\d+)?$" //浮点数
"^[A-Za-z]+$" //由26个英文字母组成的字符串
"^[A-Z]+$" //由26个英文字母的大写组成的字符串
"^[a-z]+$" //由26个英文字母的小写组成的字符串
"^[A-Za-z0-9]+$" //由数字和26个英文字母组成的字符串
"^\\w+$" //由数字、26个英文字母或者下划线组成的字符串
"^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$" //email地址
"^[a-zA-z]+://(\\w+(-\\w+)*)(\\.(\\w+(-\\w+)*))*(\\?\\S*)?$" //url
onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" //只能输入中文
onkeyup="if(isNaN(value)){alert('只能输入有效数字');execCommand('undo');}"//只能输入有效数字
onkeyup="if(!value.match(new RegExp('^[0-9]+$'))){alert('只能输入数字');this.value='';}"//只能输入整数
正则表达式
"^\\d+$" //非负整数(正整数 + 0)
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