javascript - 无法使用下面的代码在 for 循环中循环对象数组来获得正确的输出，它只采用最后一个条件

Question

查看下面的代码了解更多详情

var A1  = ["1","2","5","6"];

var A2 = [
    {label:"one", value:"1"},
    {label:"two", value:"2"},
    {label:"three", value:"3"},
    {label:"four", value:"4"},
    {label:"five", value:"5"},
    {label:"six", value:"6"},
];
for(var i=0; i<A2.length; i++){
    for(var j=0; j<A1.length; j++ ){
        if(A1[i] == A2[j].value){
            A2[ i ].disabled == true;
        }
        else{
            A2[ i ].disabled == false;
        }
    }
}         
console.log( JSON.stringify( A2 ) );

我想要以下输出:

[{"label":"one","value":"1","disabled":true}, 
{"label":"two","value":"2","disabled":true}, 
{"label":"three","value":"3","disabled":false}, 
{"label":"four","value":"4","disabled":false}, 
{"label":"five","value":"5","disabled":true}, 
{"label":"six","value":"6","disabled":true}]

Answer 1

您需要一个循环并检查值是否在 a2 中。然后将 disabled 设置为此 bool 值。

在问题中，您混淆了 i 和 j 并且您为 a1 的任何值设置了一个值。结果或多或少是随机的。

顺便说一句，我将所有变量都改为以小写开头，因为在 Javascript 中通常以大写开头的变量是为可实例化的函数或类保留的。

var a1 = ["1", "2", "5", "6"],
    a2 = [{ label: "one", value: "1" }, { label: "two", value: "2" }, { label: "three", value: "3" }, { label: "four", value: "4" }, { label: "five", value: "5" }, { label: "six", value: "6" }],
    i;

for (i = 0; i < a2.length; i++) {
    a2[i].disabled = a1.includes(a2[i].value);
}
console.log(a2);

带注释的代码。

var A1 = ["1", "2", "5", "6"];

var A2 = [
    { label: "one", value: "1" },
    { label: "two", value: "2" },
    { label: "three", value: "3" },
    { label: "four", value: "4" },
    { label: "five", value: "5" },
    { label: "six", value: "6" },
];
for (var i = 0; i < A2.length; i++) {
    A2[i].disabled = false;               // do not use a comparison, take an assignment
                                          // set to false as default value
    for (var j = 0; j < A1.length; j++) {
        if (A1[j] == A2[i].value) {       // i and j switched
            A2[i].disabled = true;        // same here with comparison where you need
                                          // an assignment
        }
    }
}

console.log(JSON.stringify(A2));