你必须像这样在数组中搜索:

function changeDesc( value, desc ) {
   for (var i in projects) {
     if (projects[i].value == value) {
        projects[i].desc = desc;
        break; //Stop this loop, we found it!
     }
   }
}

然后像这样使用它

var projects = [ ... ];
changeDesc ( 'jquery-ui', 'new description' );

更新:

为了更快:

var projects = {
   jqueryUi : {
      value:  'lol1',
      desc:   'lol2'
   }
};

projects.jqueryUi.desc = 'new string';

(根据Frédéric的评论，你不应该在对象键中使用连字符，或者你应该使用“jquery-ui”和项目["jquery-ui"]符号。)

最简单的方法就是这样做

    var projects = [
{
    
    
    value: "jquery",
    label: "jQuery",
    desc: "the write less, do more, JavaScript library",
    icon: "jquery_32x32.png"
},
{
    value: "jquery-ui",
    label: "jQuery UI",
    desc: "the official user interface library for jQuery",
    icon: "jqueryui_32x32.png"
}];

projects.find(data => data.value === "jquery").label ="xxxx"

console.log("------------>",projects)

javascript解构的力量

const projects = [ { value: 'jquery', label: 'jQuery', desc: 'the write less, do more, JavaScript library', icon: 'jquery_32x32.png', anotherObj: { value: 'jquery', label: 'jQuery', desc: 'the write less, do more, JavaScript library', icon: 'jquery_32x32.png', }, }, { value: 'jquery-ui', label: 'jQuery UI', desc: 'the official user interface library for jQuery', icon: 'jqueryui_32x32.png', }, { value: 'sizzlejs', label: 'Sizzle JS', desc: 'a pure-JavaScript CSS selector engine', icon: 'sizzlejs_32x32.png', }, ]; function createNewDate(date) { const newDate = []; date.map((obj, index) => { if (index === 0) { newDate.push({ ...obj, value: 'Jquery??', label: 'Jquery is not that good', anotherObj: { ...obj.anotherObj, value: 'Javascript', label: 'Javascript', desc: 'Write more!!! do more!! with JavaScript', icon: 'javascript_4kx4k.4kimage', }, }); } else { newDate.push({ ...obj, }); } }); return newDate; } console.log(createNewDate(projects));

这很简单

使用findIndex方法查找对象的索引。 将索引存储在变量中。 做一个简单的更新，像这样:

//Initailize array of objects. let myArray = [ {id: 0, name: "Jhon"}, {id: 1, name: "Sara"}, {id: 2, name: "Domnic"}, {id: 3, name: "Bravo"} ], //Find index of specific object using findIndex method. objIndex = myArray.findIndex((obj => obj.id == 1)); //Log object to Console. console.log("Before update: ", myArray[objIndex]) //Update object's name property. myArray[objIndex].name = "Laila" //Log object to console again. console.log("After update: ", myArray[objIndex])

用每个循环使用的条件更改值

projects.forEach((p,index)=>{
    if(index === 1){
       p.value = "Updated jquery-ui"
    }
})

您需要知道要更改的对象的索引。这很简单

projects[1].desc= "new string";