判断my=名字是否存在B这个字符:
var a = '<span my="AAC">D</span><span my="XYZ">XBZ</span><span my="KK">1</span>'; var a = '<span my="AAC"
var a = '<span my="AAC">D</span><span my="XYZ">XBZ</span><span my="KK">1</span>'; var a = '<span my="AAC"