A peptide includes SEQ ID NO: 1 (Xaa1-Tyr-Phe-Ala-Tyr-His-Pro-Asn-Ile-Pro-Gly-Leu-Xaa2-Tyr-Phe), wherein Xaa1 is any one selected from the group consisting of tyrosine, tryptophan, phenylalanine and non-natural amino acids having characteristics identical to tyrosine, tryptophan or phenylalanine； and Xaa2 is any one selected from the group consisting of tyrosine, tryptophan, phenylalanine, and non-natural amino acids having the characteristics identical to tyrosine, tryptophan or phenylalanine.
