用js使得輸入框input隻能輸入數字

JS判斷隻能是數字和小數點

1.文本框隻能輸入數字代碼(小數點也不能輸入)

<input onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')">

2.隻能輸入數字,能輸小數點.

<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">

<input name=txt1 onchange="if(/\D/.test(this.value)){alert('隻能輸入數字');this.value='';}">

3.數字和小數點方法二

<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.隻能輸入字母和漢字

<input onkeyup="value=value.replace(/[\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers">

5.隻能輸入英文字母和數字,不能輸入中文

<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">

6.隻能輸入數字和英文<font color="Red">chun</font>

<input onKeyUp="value=value.replace(/[^\d|chun]/g,'')">

7.小數點後隻能有最多兩位(數字,中文都可輸入),不能輸入字母和運算符號:

<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">

8.小數點後隻能有最多兩位(數字,字母,中文都可輸入),可以輸入運算符號:

<input onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">

隻能是數字和小數點和加減乘際

onkeypress="return event.keyCode>=4&&event.keyCode<=57"