相关疑难解决方法(0)

我有一个对象数组.我需要获取最后一个对象的对象类型(在此示例中为"shape"),将其删除,然后在数组中找到具有相同类型的前一个对象的索引,例如"shape".

var fruits = [
    { 
        shape: round,
        name: orange
    },
    { 
        shape: round,
        name: apple
    },
    { 
        shape: oblong,
        name: zucchini
    },
    { 
        shape: oblong,
        name: banana
    },
    { 
        shape: round,
        name: grapefruit
    }
]

// What's the shape of the last fruit
var currentShape =  fruits[fruits.length-1].shape;

// Remove last fruit
fruits.pop(); // grapefruit removed

// Find the index of the last round fruit
var previousInShapeType = fruits.lastIndexOf(currentShape);
    // should find apple, index = 1

所以,显然这个例子中的类型将是"圆形".但我不是在寻找"圆"的数组值.我正在寻找fruits.shape = round的地方.

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