Use js to make the input box input only contain numbers

JS judges that only numbers and decimal points are allowed. only numeric code can be entered in the text box (decimal point cannot be entered) <input onkeyup = "this. value = this. value. replace (/\ D/g, '')" onafterpaste = "this. value = this. value. replace (/\ D/g, '')"> 2. only numbers are allowed, and decimal points are allowed. <input onkeyup = "if (isNaN (value) execCommand ('undo ')" onafterpaste = "if (isNaN (value) execCommand ('undo ') "> <input name = txt1 onchange =" if (/\ D /. test (this. value) {alert ('only numbers allowed '); this. value = '';}"> 3. method 2: Number and decimal point <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. only letters and Chinese characters can be entered <input onkeyup = "value = value. replace (/[\ d]/g, '')" onbeforepaste = "clipboardData. setData ('text', clipboardData. getData ('text '). replace (/[\ d]/g, '')" maxlength = 10 name = "Numbers"> 5. you can only enter English letters and numbers, but cannot enter Chinese <input onkeyup = "value = value. replace (/[^ \ w \. \/]/Ig, '')"> 6. only numbers and English <font color = "Red"> chun </font> <input onKeyUp = "value = value. replace (/[^ \ d | chun]/g, '')"> 7. A maximum of two digits (numbers and Chinese characters) can be entered after the decimal point. Letters and operator numbers cannot be entered: <input onKeyPress = "if (event. keyCode <48 | event. keyCode> 57) & event. keyCode! = 46 | /\. \ d $ /. test (value) event. returnValue = false "> 8. only two digits (numbers, letters, and Chinese characters) can be entered after the decimal point. You can enter the operator number: <input onkeyup = "this. value = this. value. replace (/^ (\-) * (\ d + )\. (\ d ). * $/, '$1 $2. $3 ') "> it can only be a number or a decimal point, plus or minus onkeypress =" return event. keyCode> = 4 & event. keyCode <= 57"