JavaScript中将对象数组中的某个属性值，批量替换成另一个数值

原文链接

https://segmentfault.com/q/1010000010352622

希望将下列数组中的sh替换成沪，sz替换成深

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 = "沪";
  }
  if (item.placeCode == "sz") {
    item.placeCode = "深";
  }
}
写个for循环遍历一下，从第一个对象开始，发现对应的placeCode是sh则更新成文字沪，发现对应的placeCode是sz则更新成文字深，一直到最后一个对象

最简便：

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

第二种

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

　　

第三种

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

　　

再次定义一个对象，

定义一个返回vlaue的函数；

map一下