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js里合并相同数据怎么做

循环json,判断,然后累加到一个变量,最后显示这个变量就得了。 为什么不直接在后台处理这些数据呢?前台处理太low了

var c = a.concat(b),//合并成一个数组temp = {},//用于id判断重复result = [];//最后的新数组//遍历c数组,将每个item.id在temp中是否存在值做判断,如不存在则对应的item赋值给新数组,并将temp中item.id对应的key赋值,下次对相同值做判断时...

var arr1 = [{ id: 12, name: 20}, { id: 13, name: 30}];var arr2 = [{ id: 12, title: 500}, { id: 13, title: 666}];var sum = [];for (var i = 0; i < arr1.length; i++) { var obj = { id: arr1[i].id, name: arr1[i].name, title: arr2[i]...

var a = [1,2,3,4,5];var b = [1,2,4,5];alert(tab(a,b));function tab(arr1,arr2){var arr = arr1.concat(arr2);var lastArr = [];for(var i = 0;i

var a = [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ];var b = [ "foo", "bar", "baz", "bam", "bun", "fun" ];var c = a.concat( b );a; // [1,2,3,4,5,6,7,8,9]b; // ["foo","bar","baz","bam","bun","fun"]c; // [1,2,3,4,5,6,7,8,9,"foo","bar","baz","ba...

$.extend 第一个参数 是否深度copy var object1 = { apple: 0, banana: { weight: 52, price: 100 }, cherry: 97};var object2 = { banana: { price: 200 }, durian: 100}; $.extend(true,object1, object2);

求采纳,写了半天了 $(document).ready(function(){ $("button#proc").click(function(){ var sizetotle=$("table#ini").find("tr").length; //原始表的行数 var str=""; for(index=1;index 名称 种类 数量

var arr3=new ArrayList(); for(var i=0;i

这就是数组去重了。。。 var str=['hello','node','element','node','hello','blue','red']; var str1=[]; function first(args){ for(i=0;i

var da={"success": {"1": [{"t":"A4","c":"2017/7/3"}, {"t":"A2","c":"2017/7/3"},{"t":"A3","c":"2017/7/4"}, {"t":"A1","c":"2017/7/4"}], "2": [{"t":"B4","c":"2017/7/3"}, {"t":"B2","c":"2017/7/3"}, {"t":"B3","c":"2017/7/4"}, {"t":"...

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