Question

文本框只能输入正整数(大于0的整数)代码

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,'')">

如何修改以上代码实现只能输入正整数

Answer 1

<input onkeyup="if(this.value.length==1){this.value=this.value.replace(/[^1-9]/g,'')}else{this.value=this.value.replace(/\D/g,'')}" onafterpaste="if(this.value.length==1){this.value=this.value.replace(/[^1-9]/g,'')}else{this.value=this.value.replace(/\D/g,'')}">

Answer 2

<input onBlur="this.value=parseInt(this.value);if (isNaN(this.value) || this.value<=0){alert('输入错误');this.focus();};">