js特殊字符转字符串

functionutf16toEntities(str){varpatt=/\ud800-\udbff/g;//妫€娴媢tf16瀛楃姝ｅ垯str=str.replace(patt,function(char){varH,L,code;if(char.length===2){H=char.charCodeAt(0);//鍙栧嚭楂樹綅L=char.charCodeAt(1);//鍙栧嚭浣庝綅code=(H-0xD800)*0x400+0x10000+L-0xDC00;//杞崲绠楁硶return"&#"+code+";";}else{杩斿洖瀛楃锛泒});杩斿洖str;}utf16toEntities('馃榿');