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luhn验证 <script type="text/javascript"> function luhn(bankno){ alert(bankno); var lastNum = bankno.substr(bankno.length-1,1); var first15Num = bankno.substr(0,bankno.length-1); var newArr = new Array(); for(var i = first15Num.length-1;i>-1;i--){ newArr.push(first15Num.substr(i,1)); } var arrJiShu = new Array(); var arrJiShu2 = new Array(); var arrOuShu = new Array(); for(var j=0;j<newArr.length;j++){ if((j+1)%2==1){ if(parseInt(newArr[j])*2<9) arrJiShu.push(parseInt(newArr[j])*2); else arrJiShu2.push(parseInt(newArr[j])*2); } else arrOuShu.push(newArr[j]); } var jishu_child1 = new Array(); var jishu_child2 = new Array(); for(var h=0;h<arrJiShu2.length;h++){ jishu_child1.push(parseInt(arrJiShu2[h])%10); jishu_child2.push(parseInt(arrJiShu2[h])/10); } var sumJiShu=0; var sumOuShu=0; var sumJiShuChild1=0; var sumJiShuChild2=0; var sumTotal=0; for(var m=0;m<arrJiShu.length;m++){ sumJiShu=sumJiShu+parseInt(arrJiShu[m]); } for(var n=0;n<arrOuShu.length;n++){ sumOuShu=sumOuShu+parseInt(arrOuShu[n]); } for(var p=0;p<jishu_child1.length;p++){ sumJiShuChild1=sumJiShuChild1+parseInt(jishu_child1[p]); sumJiShuChild2=sumJiShuChild2+parseInt(jishu_child2[p]); } sumTotal=parseInt(sumJiShu)+parseInt(sumOuShu)+parseInt(sumJiShuChild1)+parseInt(sumJiShuChild2); var k= parseInt(sumTotal)%10==0?10:parseInt(sumTotal)%10; var luhn= 10-k; if(lastNum==luhn){ $("#banknoInfo").html("luhn验证通过"); return true; } else{ $("#banknoInfo").html("银行卡号必须符合luhn校验"); return false; } } var s = '4297690141496200' alert(luhn(s)); </script>
