移動端輸入框表情處理

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1、安卓輸入框輸入表情，會過濾掉表情

2、ios輸入框輸入表情，服務端會報錯；使用Base64轉碼能處理ios表情

//base64轉碼function Base64() {    // private property    var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";    // public method for encoding    this.encode = function (input) {        var output = "";        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;        var i = 0;        input = _utf8_encode(input);        while (i < input.length) {            chr1 = input.charCodeAt(i++);            chr2 = input.charCodeAt(i++);            chr3 = input.charCodeAt(i++);            enc1 = chr1 >> 2;            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);            enc4 = chr3 & 63;            if (isNaN(chr2)) {                enc3 = enc4 = 64;            } else if (isNaN(chr3)) {                enc4 = 64;            }            output = output +                _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +                _keyStr.charAt(enc3) + _keyStr.charAt(enc4);        }        return output;    }    // public method for decoding    this.decode = function (input) {        var output = "";        var chr1, chr2, chr3;        var enc1, enc2, enc3, enc4;        var i = 0;        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");        while (i < input.length) {            enc1 = _keyStr.indexOf(input.charAt(i++));            enc2 = _keyStr.indexOf(input.charAt(i++));            enc3 = _keyStr.indexOf(input.charAt(i++));            enc4 = _keyStr.indexOf(input.charAt(i++));            chr1 = (enc1 << 2) | (enc2 >> 4);            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);            chr3 = ((enc3 & 3) << 6) | enc4;            output = output + String.fromCharCode(chr1);            if (enc3 != 64) {                output = output + String.fromCharCode(chr2);            }            if (enc4 != 64) {                output = output + String.fromCharCode(chr3);            }        }        output = _utf8_decode(output);        return output;    }    // private method for UTF-8 encoding    var _utf8_encode = function (string) {        string = string.replace(/\r\n/g,"\n");        var utftext = "";        for (var n = 0; n < string.length; n++) {            var c = string.charCodeAt(n);            if (c < 128) {                utftext += String.fromCharCode(c);            } else if((c > 127) && (c < 2048)) {                utftext += String.fromCharCode((c >> 6) | 192);                utftext += String.fromCharCode((c & 63) | 128);            } else {                utftext += String.fromCharCode((c >> 12) | 224);                utftext += String.fromCharCode(((c >> 6) & 63) | 128);                utftext += String.fromCharCode((c & 63) | 128);            }        }        return utftext;    }    // private method for UTF-8 decoding    var _utf8_decode = function (utftext) {        var string = "";        var i = 0;        var c = 0,c1 = 0,c2 = 0 ,c3=0;        while ( i < utftext.length ) {            c = utftext.charCodeAt(i);            if (c < 128) {                string += String.fromCharCode(c);                i++;            } else if((c > 191) && (c < 224)) {                c2 = utftext.charCodeAt(i+1);                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));                i += 2;            } else {                c2 = utftext.charCodeAt(i+1);                c3 = utftext.charCodeAt(i+2);                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));                i += 3;            }        }        return string;    }}

移動端輸入框表情處理