判断字符的一些js代码收集
/**
* \brief 求得一个字符串的ANSI字符串长度
* \param value 传入的UNICODE字符串
* \return 返回字符串的ANSI字符串长度
*/
function ByteWordCount(value) {
var txt = value;
txt = txt.replace(/(<.*?>)/ig,'');
txt = txt.replace(/([\u0391-\uFFE5])/ig,'11');
return txt.length;
}
/**
* \brief 判断一个字符是否是字母
* \param ch 要判断的字符
* \return true 是 false 不是
*/
function isAlpha(ch) {
if(ch >= "a" && ch <= "z") return true;
if(ch >= "A" && ch <= "Z") return true;
return false;
}
/**
* \brief 判断一个字符是否是数字
* \param ch 要判断的字符
* \return true 是 false 不是
*/
function isNumber(ch) {
if(ch >= "0" && ch <= "9") return true;
return false;
}
/**
* \brief 判断一个字符是否是可打印标点符号
* \param ch 要判断的字符
* \return true 是 false 不是
*/
function isSpecial(ch) {
var special = new Array("!","\"","#","$","%","&","'","(",")","*","+",",","-",".","/",":",";","<","=",">","?","@","[","\\","]","^","_","`","{","|","}","~")
for(var i=0;i<special.length;++i)
if(ch == special[i]) return true;
return false;
}
function CheckValidStr(value)
{
var count=0;
for(var i=0;i<value.length;++i)
{
var ch = value.charAt(i);
if(isAlpha(ch)||isNumber(ch)||isSpecial(ch))
count++;
else
count=0;
if(count>20)
{
return false;
}
}
return true;
}