Question

js知道数组中某条数据的某个属性的值，怎么得到这条数据或者这条数据的下标

var arr=[{"id":22,"name":张三,"age":18,"sex":女,.....},{"id":23,"name":张四,"age":17,"sex":男,.....},{"id":24,"name":王五,"age":18,"sex":男,.....},{"id":25,"name":李六,"age":18,"sex":女,.....},{"id":29,"name":赵七,"age":18,"sex":女,.....},.............]
我现在只知道id=24，怎么获得id=24的这条数据，或者id=24的这条数据的下标

Answer 1

var arr=[{"id":22,"name":'张三',"age":18,"sex":'女'},{"id":23,"name":'张四',"age":17,"sex":'男'},{"id":24,"name":'王五',"age":18,"sex":'男'},{"id":25,"name":'李六',"age":18,"sex":'女'}]
for (var value of arr) {
if(value.id == "24")
console.log(value);
}

Answer 2

function getArrayItemIndex(arr, id) {
    var index = -1;
    if (typeof Array.prototype.findIndex === 'function') {
        index = arr.findIndex(function(item) {
            return item.id === id;
        });
    }
    else {
        for (var i = 0; i < arr.length;i++) {
            if (arr[i].id === id) {
                index = i;
                break;
            }
        }
    }
    
    return index;
}