获取中英文统一的长度
//将中文字符的长度转换为英文字符的长度
function utf16to8(str) {
//去除左右空格
str=str.replace(/\\r/g,"\r");
str=str.replace(/\\n/g,"\n");
var out, i, len, c;
out = "";
len = str.length;
for(i = 0; i < len; i++) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out += str.charAt(i);
//alert("1---"+out+"---"+out.length);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
//alert("2---"+out+"---"+out.length);
} else {
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
//alert("3---"+out+"---"+out.length);
}
}
return out;
}
使用方法：utf16to8(obj.val()).length
