Question

我有几个id和高度的数组。

如何获得特定身份证的高度？

喜欢从数组中获取review-1的值吗？这是“500px”？

感谢。

 ar=[];
 ar.push({"id":"reiew-1","height":"500px"});

 $.each(ar,function(index,value){

 alert(value.height); // gets all the heights

});

Answer 1

在循环中使用if条件

ar = [];
ar.push({
    "id": "reiew-1",
    "height": "500px"
});

$.each(ar, function (index, value) {
    if (value.id == 'reiew-1') {
        alert(value.height); // gets all the heights
        return false;//stop further looping of the array since the value you are looking for is found
    }
});

Answer 2

所以你只能使用javascript方法来做这件事

var ar=[];
ar.push({"id":"reiew-1","height":"500px"}, {"id":"reiew-3","height":"500px"});

// function that filter and return object with selected id
function getById(array, id){
  return array.filter(function(item){
    return item.id == id;
  })[0].height || null;
}

// now you can use this method
console.log(getById(ar, "reiew-1"))

您可以使用此代码demo

Answer 3

你可以去functional做类似的事情：

ar=[
    {"id":"reiew-1","height":"500px"},
    {"id":"reiew-2","height":"600px"},
    {"id":"reiew-3","height":"700px"},
];

filterById=function(value){
    return function(o){
        return o["id"]===value;
    };        
}

getAttribute=function(value){
    return function(o){
        return o[value];
    }
}

ar.filter(filterById("reiew-1")).map(getAttribute("height"))

眼睛很容易：]

以下是fiddle

有关更多信息（例如有关浏览器兼容性），以下是MDN链接：Array.prototype.filter()和Array.prototype.map()

如何从数组中获取对象的值？

3 个答案: