88 lines
2.5 KiB
Plaintext
88 lines
2.5 KiB
Plaintext
/**
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* 商品条码严格按照国际通用码
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* @author tmzdy
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* @description 资料参考：https://zhuanlan.zhihu.com/p/120676811
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*/
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class ean13 {
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//编码数据
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data=""
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//护码
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safeCode = "101"
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middleCode = "01010"
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//编码方式，我们中国是6：LGGGLL
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EAN13_STRUCTURE = [
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'LLLLLL', 'LLGLGG', 'LLGGLG', 'LLGGGL', 'LGLLGG',
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'LGGLLG', 'LGGGLL', 'LGLGLG', 'LGLGGL', 'LGGLGL'
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];
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constructor(text:string) {
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let data = text;
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if (data.search(/^[0-9]{12}$/)!== -1 as number ) {
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data += (this.checksum(data)).toString();
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}
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this.data = data.toUpperCase();
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}
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//校验码。
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checksum(codestr:string):number{
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const res = codestr.substring(0, 12).split('')
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const resNumber = res.map((n:string):number => parseInt(n))
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const jg=resNumber.reduce((sum:number, a:number, idx:number):number => (idx % 2) > 0 ? sum + a * 3 : sum + a, 0);
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return (10 - (jg % 10)) % 10;
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}
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//按钮编码规则提取逻辑值，
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getEan13Str(key:string):string[]{
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if(key=="L") return [
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'0001101', '0011001', '0010011', '0111101', '0100011',
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'0110001', '0101111', '0111011', '0110111', '0001011'
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]
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if(key=="G") return [
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'0100111', '0110011', '0011011', '0100001', '0011101',
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'0111001', '0000101', '0010001', '0001001', '0010111'
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]
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if(key=="R") return [
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'1110010', '1100110', '1101100', '1000010', '1011100',
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'1001110', '1010000', '1000100', '1001000', '1110100'
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]
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return [] as string[];
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}
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encodeByGuzhe(dataStr:string, structure:string):string{
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let encoded = dataStr.split('')
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let atrartys = [] as string[][]
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for(let i=0;i<encoded.length;i++){
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let chart = structure.substring(i,i+1)
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atrartys.push(this.getEan13Str(chart))
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}
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let encoded_str = atrartys.map((val:string[], idx:number):string => {
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let stur = dataStr.substring(idx,idx+1)
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return val[parseInt(stur)]
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});
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return encoded_str.join("")
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};
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encode():string[] {
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// 取编码方式。
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let codeFang = this.EAN13_STRUCTURE[parseInt(this.data.substring(0,1))]
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//取后面的12位数字
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let data = this.data.substring(1,13)
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let leftCode = data.substring(0,6)
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let rightCode = data.substring(6,13)
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let left_code_str = this.encodeByGuzhe(leftCode,codeFang);
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//右资料码按规则是物料码+校验码
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let right_code_str = this.encodeByGuzhe(rightCode,"RRRRRR");
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// 组合码制
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//护码+左资料码+中间码+右资料码+护码
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// let totalcode = this.safeCode+left_code_str+this.middleCode+right_code_str+this.safeCode
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return [this.safeCode,left_code_str,this.middleCode,right_code_str,this.safeCode]
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}
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}
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export { ean13 };
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