关于 js 数组 setter

Question

需求：object.array[index] = value 时调用 setter

Answer 1

利用Proxy:

var arr = []
var proxyArr = new Proxy(arr, {    
    set: function(target, key, value) {    
        // do something    
        console.log(`key=${key}, value=${value}`);
        target[key] = value; 
    }
});


proxyArr[0] = 12;