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[英]ReactJS change color of element on scroll and when certain position is reached
[英]Change element array when the data is not certain index position
我正在学习 javascript 对象数组,当我从 API 获取数据时,有时我会在不确定的索引位置从 API 获取数据,例如像这样:
[
{formatted_name: 'central_java', name: 'Central Java'},
{formatted_name: 'east_java', name: 'East Java'},
{formatted_name: 'west_java', name: 'West Java'},
];
有时像这样:
[
{formatted_name: 'east_java', name: 'East Java'},
{formatted_name: 'central_java', name: 'Central Java'},
{formatted_name: 'west_java', name: 'West Java'},
];
有时也是这样:
[
{formatted_name: 'west_java', name: 'West Java'},
{formatted_name: 'central_java', name: 'Central Java'},
{formatted_name: 'east_java', name: 'East Java'},
];
我想问的是,当我从 fetch API 获取数据时,如何创建条件或更改数组元素的位置,以便formatted_name: 'east_java'
始终索引为 0?
我试过这段代码,但它不起作用:
function insertAndShift(arr, from, to) {
let cutOut = arr.splice(from, 1)[0];
arr.splice(to, 0, cutOut);
}
使用上面的代码时,代码不能灵活,因为formatted_name: 'east_java'
总是不确定它在什么索引上。 我该怎么办?
请找到以下代码:
test = [ {formatted_name:'west_java', name:'West Java'}, {formatted_name:'central_java', name:'Central Java'}, {formatted_name: 'east_java', name:'East Java'}, ]; test.forEach(function(value, key) { if (value.formatted_name == "east_java"){ test.splice(key, 1); test.unshift(value) } }); console.log(test);
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