下面的代码来自jQuery UI自动完成:
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"
},
{
value: "sizzlejs",
label: "Sizzle JS",
desc: "a pure-JavaScript CSS selector engine",
icon: "sizzlejs_32x32.png"
}
];
例如，我想更改jquery-ui的desc值。我该怎么做呢?
此外，是否有更快的方法来获取数据?我的意思是给对象一个名字来获取它的数据，就像数组中的对象一样?比如jquery-ui。jquery-ui。desc = ....
这是我对这个问题的回应。我的下划线版本是1.7，因此我不能使用. findindex。
所以我手动获取了item的索引并替换了它。这里是相同的代码。
var students = [
{id:1,fName:"Ajay", lName:"Singh", age:20, sex:"M" },
{id:2,fName:"Raj", lName:"Sharma", age:21, sex:"M" },
{id:3,fName:"Amar", lName:"Verma", age:22, sex:"M" },
{id:4,fName:"Shiv", lName:"Singh", age:22, sex:"M" }
]
下面的方法将用对象中更多的属性替换id:4的学生
function updateStudent(id) {
var indexOfRequiredStudent = -1;
_.each(students,function(student,index) {
if(student.id === id) {
indexOfRequiredStudent = index; return;
}});
students[indexOfRequiredStudent] = _.extend(students[indexOfRequiredStudent],{class:"First Year",branch:"CSE"});
}
使用下划线1.8，它将被简化，因为我们有方法_.findIndexOf。
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));
const state = [
{
userId: 1,
id: 100,
title: "delectus aut autem",
completed: false
},
{
userId: 1,
id: 101,
title: "quis ut nam facilis et officia qui",
completed: false
},
{
userId: 1,
id: 102,
title: "fugiat veniam minus",
completed: false
},
{
userId: 1,
id: 103,
title: "et porro tempora",
completed: true
}]
const newState = state.map(obj =>
obj.id === "101" ? { ...obj, completed: true } : obj
);
