后台返回数据是字符串，可是转换总是报错

1 var str="[{symbol:"sh000001",name:"上证指数",trade:"3074.9448",pricechange:"-29.204",changepercent:"-0.941",buy:"0",sell:"0",settlement:"3104.1487",open:"3058.8016",high:"3086.9961",low:"3051.5766",volume:259658612,amount:255833986566,code:"000001",ticktime:"13:33:04"}]"
2 // 1.先转换数组
3 var arr1=str.split(‘},‘);

//2.去掉数组中的下标为0 和数组最后一个 ： ‘[’  和  ‘]’
arr1[0]=arr1[0].replace(‘[‘,‘‘);
arr1[arr1.length-1]=arr1[arr1.length-1].replace(‘]‘,‘‘);

//循环数组 只有一个eval会报错 未解

for(var i in arr1){
  if(i<arr1.length-1){
    _this.myArray.push(eval("(" +eval("(" +JSON.stringify(arr1[i]+"}") + ")" )+ ")" ))
  }
}

 var arr1=data.split(‘},‘);
          arr1[arr1.length-1]=arr1[arr1.length-1].replace(‘]‘,‘‘);
          arr1[0]=arr1[0].replace(‘[‘,‘‘);

          for(var i in arr1){
            if(i<arr1.length-1){
              _this.myArray.push( eval("(" +arr1[i]+"}" + ")" ))
            }
          }