js数组内根据key合并,value值相加

var arr1 = [
	{name: '小白', value: 4},
	{name: '小黑', value:6},
	{name: '小红', value: 11},
	{name: '小黑', value: 8}
];

function mergeObject(arr, name) {
	const result = arr.reduce((obj, item) => {
		if (!obj[item.name]) {
			obj[item.name] = 0;
		}
		obj[item.name] += item.value;
		return obj;
	}, {});
	return Object.keys(result).map(name => ({
		name: name,
		value: result[name]
	}));
}

console.log(mergeObject(arr1))