1、测试字符串长度（中英文）
function strLen(s){ var i,str1,str2,str3,nLen; str1 = s.value; nLen = 0; for(i=1;i<=str1.length;i++) { str2=str1.substring(i-1,i) str3=escape(str2); if(str3.length>3) { nLen = nLen + 2; } else { nLen = nLen + 1; } } return nLen;}2、替换
function Replace(s1,s2,s3){ var len1 , len2 , i; var str1 , str2 ; str1 = s1; len1 = str1.length; len2 = s2.length; if (len2 > len1) return s1; for (i=1;i<= len1-len2+1 ; i++) { str2 = str1.substring(i-1,i-1+len2); if (str2 == s2) { str1 = str1.substring(0,i-1) + s3 + str1.substring(i+len2-1,len1 ); i = 0; len1 = str1.length; } } return str1;}
3、查找function Pos(s1,s2){ var len1 , len2 , i,flag; var str1 , str2 ; str1 = s1; len1 = str1.length; len2 = s2.length; if (len2==0 || len1==0) return 0; flag = false; if (len2 > len1) return s1; for (i=1;i<= len1-len2+1 ; i++) { str2 = str1.substring(i-1,i-1+len2); if (str2 == s2) { flag = true; break; } } if (flag) return i; else return 0;}
