jq/jquery 當輸入框輸入11位數(shù)字，將自動判斷。

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!DOCTYPE?html

html

head

titlejqjquery?當輸入框輸入11位數(shù)字，將自動判斷。/title

meta?charset="UTF-8"?/

script

window.onload?=?function(){

document.getElementById('phone').onkeyup?=?function(){

var?length?=?this.value.length,

state?=?'';

if(length?==?11){

switch(this.value.substr(0,?3)){

case?'130'?:

case?'131'?:

case?'132'?:

case?'155'?:

case?'156'?:

case?'185'?:

case?'186'?:

case?'145'?:

case?'176'?:

state?=?'聯(lián)不通';

break;

case?'133'?:

case?'153'?:

case?'180'?:

case?'181'?:

case?'189'?:

case?'177'?:

state?=?'電不信';

break;

case?'134'?:

case?'135'?:

case?'136'?:

case?'137'?:

case?'138'?:

case?'139'?:

case?'150'?:

case?'151'?:

case?'152'?:

case?'157'?:

case?'158'?:

case?'159'?:

case?'182'?:

case?'183'?:

case?'184'?:

case?'187'?:

case?'188'?:

case?'147'?:

case?'178'?:

state?=?'移不動';

break;

default?:

state?=?'未知號碼段';

}

document.getElementById('phoneState').innerHTML?=?state;

}else?if(length??11){

this.value?=?this.value.substr(0,?11);?//超出11位剪掉

}

}

}

/script

/head

body

input?type="text"?id="phone"?/span?id="phoneState"/span

/body

/html

jquery 如何判斷input中輸入的數(shù)字長度，長度不為10彈出警告

input?type="text"?id="test"

$(?"#test"?).bind(?"change",?function()?{

if(?this.value.length?!==?10?)?{

alert(?"長度不為10"?);

}

}?);

求jquery判斷字符串只能為數(shù)字、字母、下劃線或中文的方法？

我已經(jīng)測試通過

直接可以運行：

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"

html

head

title/title

script type="text/javascript"

function test() {

var regex = /^[^_][A-Za-z]*[a-z0-9_]*$/ ;

var inputValue = document.getElementById("input_txt").value;

var ret = regex.test(inputValue);

if (ret == true) {

alert("輸入正確");

} else {

alert("輸入錯誤");

}

}

/script

/head

body

input type="text" id="input_txt"/

input type="button" id="input_btn" onclick="test();" value="測 試"/

/body

/html