json数组把相同key 值合并，value相加
vararr=[{name:"上海",value:1},{name:"上海",value:2},{name:"北京",value:3},{name:"杭州",value:...
var arr = [{name: "上海", value: 1},{name: "上海", value: 2},{name: "北京", value: 3},{name: "杭州", value: 2}]
arr = [{name: "上海", value: 3},{name: "北京", value: 3},{name: "杭州", value: 2}] 展开
arr = [{name: "上海", value: 3},{name: "北京", value: 3},{name: "杭州", value: 2}] 展开
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