Question

我试图查看数组中是否存在某个键，如果存在，则返回它的值：

if(jQuery.inArray(live_ids.grade, item.SizePrice) !== -1) {

    console.log(item.SizePrice);

}

这将返回：

{"8":"15.00","7":"20.00","1":"6.00","6":"11.00","2":"7.00","3":"8.00","4":"9.00","5":"10.00","11":"20.00","9":"10.00","10":"15.00","13":""}

现在，live_ids.grade = 9，所以我希望能够返回10.00 ...我该怎么做？

Answer 1

在这里检查数字是否在obj中，而不是执行else show error。

＆＃13;

var obj = {
    "8":"15.00",
    "7":"20.00",
    "1":"6.00",
    "6":"11.00",
    "2":"7.00",
    "3":"8.00",
    "4":"9.00",
    "5":"10.00",
    "11":"20.00",
    "9":"10.00",
    "10":"15.00",
    "13":""
};

var number = 9;

if(number in obj){
    alert(obj[number])
} else {
    alert("This number does not exists")
}

＆＃13;

Answer 2

item.SizePrice似乎是Object，而不是Array。您可以在对象上使用for..in循环，break在console.log()调用后的循环

var items = {
    "8": "15.00",
    "7": "20.00",
    "1": "6.00",
    "6": "11.00",
    "2": "7.00",
    "3": "8.00",
    "4": "9.00",
    "5": "10.00",
    "11": "20.00",
    "9": "10.00",
    "10": "15.00",
    "13": ""
  },
  n = 9;

for (var prop in items) {
  if (items[n]) {
    console.log(items[n]);
    break;
  }
}

Answer 3

这是你的解决方案......

<script type="text/javascript">
        var a={"k1": 100, "k2": 200, "k3": 300};
        var ky=prompt("enter key :");
        for (var k in a){
    if (a.hasOwnProperty(k)) {
        if(k==ky){
         alert("Key is " + k + ", value is" + a[k]);
        }
    }
}   
    </script>

jQuery：如果key存在于数组中，则获取值

3 个答案: