SKU前端算法DEMO

admin · 发表于 2016-6-21 17:41:12

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SKU前端算法DEMO

类似淘宝的SKU前端算法DEMO，code：

<!doctype html>
<html lang="zh-cn">
<head>
<meta charset="utf-8" />
<title>SKU demo</title>
<style type="text/css">
*,body,button,input,textarea,select{text-rendering:optimizeLegibility;-moz-osx-font-smoothing:grayscale;}
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{margin:0;padding:0;}
table{border-collapse:collapse;border-spacing:0;}
fieldset,img{border:0;}
address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal;}
ol,ul{list-style:none;}
caption,th{text-align:left;}
h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;}
q:before,q:after{content:'';}
abbr,acronym{border:0;}
.bh-sku-selected{color:red;}
</style>
</head>
<body>
<div>
属性1：
<input type="button" class="sku" attr_id="10" value="10"/>
</div>
<div>
属性2：
<input type="button" class="sku" attr_id="20" value="20"/>
<input type="button" class="sku" attr_id="21" value="21"/>
<input type="button" class="sku" attr_id="22" value="22"/>
<input type="button" class="sku" attr_id="23" value="23"/>
<input type="button" class="sku" attr_id="24" value="24"/>
</div>
<div>
属性3：
<input type="button" class="sku" attr_id="30" value="30"/>
<input type="button" class="sku" attr_id="31" value="31"/>
<input type="button" class="sku" attr_id="32" value="32"/>
<input type="button" class="sku" attr_id="33" value="33"/>
<input type="button" class="sku" attr_id="34" value="34"/>
<input type="button" class="sku" attr_id="35" value="35"/>
<input type="button" class="sku" attr_id="36" value="36"/>
<input type="button" class="sku" attr_id="37" value="37"/>
<input type="button" class="sku" attr_id="38" value="38"/>
</div>
<div>
属性4：
<input type="button" class="sku" attr_id="40" value="40"/>
</div>
<span id="init_time">init sku time: </span> <br />
<span id="price">--</span> <br />
<script type="text/javascript" src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>
<script type='text/javascript'>//<![CDATA[
$(window).load(function(){
var startTime = new Date().getTime();
//属性集
var keys = [
['10'],
['20','21','22','23','24'],
['30','31','32','33','34','35','36','37','38'],
['40']
];
//后台读取结果集
var data = {
"10;24;31;40": {
price:366,
count:46
},
"10;24;32;40": {
price:406,
count:66
},
"10;24;33;40": {
price:416,
count:77
},
"10;24;34;40": {
price:456,
count:9
},
"10;24;35;40": {
price:371,
count:33
},
"10;24;36;40": {
price:411,
count:79
},
"10;24;37;40": {
price:421,
count:87
},
"10;24;38;40": {
price:461,
count:9
},
"10;24;30;40": {
price:356,
count:59
},
"10;23;31;40": {
price:366,
count:50
},
"10;23;32;40": {
price:406,
count:9
},
"10;23;33;40": {
price:416,
count:90
},
"10;23;34;40": {
price:456,
count:10
},
"10;23;35;40": {
price:371,
count:79
},
"10;23;36;40": {
price:411,
count:90
},
"10;23;37;40": {
price:421,
count:10
},
"10;23;38;40": {
price:461,
count:9
},
"10;23;30;40": {
price:356,
count:46
},
"10;22;31;40": {
price:356,
count:27
},
"10;22;32;40": {
price:396,
count:38
},
"10;22;33;40": {
price:406,
count:42
},
"10;22;34;40": {
price:446,
count:50
},
"10;22;35;40": {
price:361,
count:25
},
"10;22;36;40": {
price:401,
count:40
},
"10;22;37;40": {
price:411,
count:43
},
"10;22;38;40": {
price:451,
count:42
},
"10;21;31;40": {
price:366,
count:79
},
"10;21;32;40": {
price:406,
count:79
},
"10;21;33;40": {
price:416,
count:10
},
"10;21;34;40": {
price:456,
count:10
},
"10;21;35;40": {
price:371,
count:87
},
"10;21;36;40": {
price:411,
count:10
},
"10;21;37;40": {
price:421,
count:10
},
"10;21;38;40": {
price:461,
count:80
},
"10;21;30;40": {
price:356,
count:43
},
"10;20;31;40": {
price:356,
count:46
},
"10;20;32;40": {
price:396,
count:49
},
"10;20;33;40": {
price:406,
count:65
},
"10;20;34;40": {
price:446,
count:10
},
"10;20;35;40": {
price:361,
count:34
},
"10;20;36;40": {
price:401,
count:41
},
"10;20;37;40": {
price:411,
count:36
},
"10;20;38;40": {
price:451,
count:42
},
"10;20;30;40": {
price:346,
count: 3
}
}
//保存最后的组合结果信息
var SKUResult = {};
//获得对象的key
function getObjKeys(obj) {
if (obj !== Object(obj)) throw new TypeError('Invalid object');
var keys = [];
for (var key in obj)
if (Object.prototype.hasOwnProperty.call(obj, key))
keys[keys.length] = key;
return keys;
}
//把组合的key放入结果集SKUResult
function add2SKUResult(combArrItem, sku) {
var key = combArrItem.join(";");
if(SKUResult[key]) {//SKU信息key属性·
SKUResult[key].count += sku.count;
SKUResult[key].prices.push(sku.price);
} else {
SKUResult[key] = {
count : sku.count,
prices : [sku.price]
};
}
}
//初始化得到结果集
function initSKU() {
var i, j, skuKeys = getObjKeys(data);
for(i = 0; i < skuKeys.length; i++) {
var skuKey = skuKeys[i];//一条SKU信息key
var sku = data[skuKey]; //一条SKU信息value
var skuKeyAttrs = skuKey.split(";"); //SKU信息key属性值数组
var len = skuKeyAttrs.length;
//对每个SKU信息key属性值进行拆分组合
var combArr = arrayCombine(skuKeyAttrs);
for(j = 0; j < combArr.length; j++) {
add2SKUResult(combArr[j], sku);
}
//结果集接放入SKUResult
SKUResult[skuKey] = {
count:sku.count,
prices:[sku.price]
}
}
}
/**
* 从数组中生成指定长度的组合
*/
function arrayCombine(targetArr) {
if(!targetArr || !targetArr.length) {
return [];
}
var len = targetArr.length;
var resultArrs = [];
// 所有组合
for(var n = 1; n < len; n++) {
var flagArrs = getFlagArrs(len, n);
while(flagArrs.length) {
var flagArr = flagArrs.shift();
var combArr = [];
for(var i = 0; i < len; i++) {
flagArr[i] && combArr.push(targetArr[i]);
}
resultArrs.push(combArr);
}
}
return resultArrs;
}
/**
* 获得从m中取n的所有组合
*/
function getFlagArrs(m, n) {
if(!n || n < 1) {
return [];
}
var resultArrs = [],
flagArr = [],
isEnd = false,
i, j, leftCnt;
for (i = 0; i < m; i++) {
flagArr[i] = i < n ? 1 : 0;
}
resultArrs.push(flagArr.concat());
while (!isEnd) {
leftCnt = 0;
for (i = 0; i < m - 1; i++) {
if (flagArr[i] == 1 && flagArr[i+1] == 0) {
for(j = 0; j < i; j++) {
flagArr[j] = j < leftCnt ? 1 : 0;
}
flagArr[i] = 0;
flagArr[i+1] = 1;
var aTmp = flagArr.concat();
resultArrs.push(aTmp);
if(aTmp.slice(-n).join("").indexOf('0') == -1) {
isEnd = true;
}
break;
}
flagArr[i] == 1 && leftCnt++;
}
}
return resultArrs;
}
//初始化用户选择事件
$(function() {
initSKU();
var endTime = new Date().getTime();
$('#init_time').text('init sku time: ' + (endTime - startTime) + " ms");
$('.sku').each(function() {
var self = $(this);
var attr_id = self.attr('attr_id');
if(!SKUResult[attr_id]) {
self.attr('disabled', 'disabled');
}
}).click(function() {
var self = $(this);
//选中自己，兄弟节点取消选中
self.toggleClass('bh-sku-selected').siblings().removeClass('bh-sku-selected');
//已经选择的节点
var selectedObjs = $('.bh-sku-selected');
if(selectedObjs.length) {
//获得组合key价格
var selectedIds = [];
selectedObjs.each(function() {
selectedIds.push($(this).attr('attr_id'));
});
selectedIds.sort(function(value1, value2) {
return parseInt(value1) - parseInt(value2);
});
var len = selectedIds.length;
var prices = SKUResult[selectedIds.join(';')].prices;
var maxPrice = Math.max.apply(Math, prices);
var minPrice = Math.min.apply(Math, prices);
$('#price').text(maxPrice > minPrice ? minPrice + "-" + maxPrice : maxPrice);
//用已选中的节点验证待测试节点 underTestObjs
$(".sku").not(selectedObjs).not(self).each(function() {
var siblingsSelectedObj = $(this).siblings('.bh-sku-selected');
var testAttrIds = [];//从选中节点中去掉选中的兄弟节点
if(siblingsSelectedObj.length) {
var siblingsSelectedObjId = siblingsSelectedObj.attr('attr_id');
for(var i = 0; i < len; i++) {
(selectedIds[i] != siblingsSelectedObjId) && testAttrIds.push(selectedIds[i]);
}
} else {
testAttrIds = selectedIds.concat();
}
testAttrIds = testAttrIds.concat($(this).attr('attr_id'));
testAttrIds.sort(function(value1, value2) {
return parseInt(value1) - parseInt(value2);
});
if(!SKUResult[testAttrIds.join(';')]) {
$(this).attr('disabled', 'disabled').removeClass('bh-sku-selected');
} else {
$(this).removeAttr('disabled');
}
});
} else {
//设置默认价格
$('#price').text('--');
//设置属性状态
$('.sku').each(function() {
SKUResult[$(this).attr('attr_id')] ? $(this).removeAttr('disabled') : $(this).attr('disabled', 'disabled').removeClass('bh-sku-selected');
})
}
});
});
});//]]>
</script>
</body>
</html>

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