JS Limit text Box input number

1. Enter a positive integer greater than 0

<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, ')} ">

2, the text box can only enter a numeric code (the decimal point can not be entered)

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

3, can only enter a number, to lose a decimal point.

<input onkeyup= "if (IsNaN (value)) ExecCommand (' Undo ')" Onafterpaste= "if (IsNaN (value)) ExecCommand (' Undo ')" >
<input name=txt1 onchange= "if (/\d/.test (this.value)) {alert (' Input number only '); this.value= ';}" >

4, digit and decimal method two

<input type=text t_value= "" o_value= "" onkeypress= "if (!this.value.match.? \d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match (?: [/^ (?: \. \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+)?)? $/)) This.o_value=this.value "onblur=" if (!this.value.match (?: [/^ (?: \). \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} ">

Summary: Encapsulate as a separate function

function KeyPress (ob) {
if (!ob.value.match (/^[\+\-]?\d*?\.? \d*?$/)) Ob.value = Ob.t_value; else Ob.t_value = Ob.value; if (Ob.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)?)? $/)) Ob.o_value = Ob.value;
}
function KeyUp (ob) {
if (!ob.value.match (/^[\+\-]?\d*?\.? \d*?$/)) Ob.value = Ob.t_value; else Ob.t_value = Ob.value; if (Ob.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)?)? $/)) Ob.o_value = Ob.value;
}
function OnBlur (ob) {
if (!ob.value.match/^ (?: [\+\-]?\d+ (?: \. \d+)? | \.\d*?)? $/) ob.value=ob.o_value;else{if (Ob.value.match (/^\.\d+$/)) ob.value=0+ob.value;if (Ob.value.match (/^\.$/)) Ob.value=0;ob.o_value=ob.value};
}

5. Only letters and kanji can be entered

<input onkeyup= "Value=value.replace (/[\d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">

6, can only enter English letters and numbers, can not input Chinese

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

7. Only enter numbers and English

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

8, the decimal point can only have a maximum of two digits (numbers, Chinese can be entered), can not enter letters and operation symbols:

<input onkeypress= "if ((event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.test ( Value)) Event.returnvalue=false ">

9, after the decimal point can only have up to two digits (numbers, letters, Chinese can be entered), you can enter the operation symbol:

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

JS Limit text Box input number