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var arr = ["ABC","BD","BEF","abc","BDA","BACD"];
for(var i=0;i<arr.length;i++){
console.log(/^a?b?c?d?e?f?g?h?i?j?k?l?m?n?o?p?q?r?s?t?u?v?w?x?y?z?$/i.test(arr[i]));
}
function fun(val){for(var i=0 ; i<val.length-1 ; i++){if(val.charAt(i).charCodeAt()>=val.charAt(i+1).charCodeAt()){alert("不符合要求");break;}}}
fun("ABCDA");