JavaScript中將對象數組中的某個屬性值，批量替換成另一個數值

原文鏈接

https://segmentfault.com/q/1010000010352622

希望將下列數組中的sh替換成滬，sz替換成深

var stooges = [
            {label:1,value:1,placeCode: 'sh', stock_code: 40},
            {label:1,value:1,placeCode: 'sh', stock_code: 50},
            {label:1,value:1,placeCode: 'sz', stock_code: 60,status:1},
            {label:1,value:1,placeCode: 'sz', stock_code: 39,status:1}
        ];

我能想到的：

var stooges = [
  {label: 1, value: 1, placeCode: 'sh', stock_code: 40},
  {label: 1, value: 1, placeCode: 'sh', stock_code: 50},
  {label: 1, value: 1, placeCode: 'sz', stock_code: 60, status: 1},
  {label: 1, value: 1, placeCode: 'sz', stock_code: 39, status: 1}
];

for (var i = 0; i < stooges.length; i++) {
  var item = stooges[i];
  if (item.placeCode == "sh") {
    item.placeCode = "滬";
  }
  if (item.placeCode == "sz") {
    item.placeCode = "深";
  }
}
寫個for循環遍歷一下，從第一個對象開始，發現對應的placeCode是sh則更新成文字滬，發現對應的placeCode是sz則更新成文字深，一直到最后一個對象

 

最簡便：

for(var i=0;i<stooges.length;i++){
    stooges[i].placeCode === 'sh'?stooges[i].placeCode = '滬': stooges[i].placeCode = '深'
}

 

第二種

var maps= new Map([['sh','滬'],['sz','深圳']]);
stooges = stooges.map(element =>{
    element.placeCode = maps.get(element.placeCode);
    return element;
});

　　

第三種

var toStr = {
    sh : '滬',
    sz : '深'    
};
stooges.map(function(value){
    var placeCode = value.placeCode;
    value.placeCode = toStr[placeCode] ? toStr[placeCode] : placeCode;
    return value;
}); 

　　

再次定義一個對象，

定義一個返回vlaue的函數；

map一下