返回字符长度，一个汉字=3个字节
check.charrs=function(str){
var wordwide = 0;
for (var i=0; i<str.length; i++) {
var c = str.charCodeAt(i);
if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {//单字节加1
wordwide++;
}else {
wordwide+=3;
}
}
return wordwide;
}
</script>