javascript - 如何使用 angularjs 或 javascript 从数组中获取字符串

Question

var array = [
      {id: 1, text: "one"},
      {id: 2, text: "two"},
      {id: 3, text: "three"},
      {id: 4, text: "four"},
      {id: 5, text: "five"}
    ];

var name = array.find(function(item){
          return item.id == $localStorage.id;
 });

返回我{id: 2, text: "two"}预计只有两个字符串，没有其他内容应该打印

Answer 1

可以先找到对象，然后得到text通过检查 find() 是否有属性操作实际上返回了一个对象或者它是 undefined .

var array = [{
    id: 1,
    text: "one"
  },
  {
    id: 2,
    text: "two"
  },
  {
    id: 3,
    text: "three"
  },
  {
    id: 4,
    text: "four"
  },
  {
    id: 5,
    text: "five"
  }
];

var findObj = array.find(function(item) {
  return item.id == 2;
});
//check if findObj is defined or not
var name = findObj? findObj.text: null;
console.log(name);

您还可以使用解构来获得 text直接从 find() 获取值如果您确定该 localStorage 值存在该对象。否则会报错。

var array = [{
    id: 1,
    text: "one"
  },
  {
    id: 2,
    text: "two"
  },
  {
    id: 3,
    text: "three"
  },
  {
    id: 4,
    text: "four"
  },
  {
    id: 5,
    text: "five"
  }
];

var {text} = array.find(function(item) {
  return item.id == 2;
});
console.log(text);