使用JavaScript从数组中删除对象

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资料来源非AMP版本编辑

使用JavaScript从数组中删除对象

如何从一个数组中删除一个对象？我希望从someArray中删除包含Kristian的对象。比如说

someArray = [{name:"Kristian", lines:"2,5,10"},
             {name:"John", lines:"1,19,26,96"}];

我想实现的是：

someArray = [{name:"John", lines:"1,19,26,96"}];

Sunil Garg

已编辑的问题 6日六月 2018 в 6:19

编程

arrays javascript

5日四月 2012 в 8:07

21 种观点

Jon

资料来源非AMP版本编辑

清洁的解决方案是使用Array.filter。

var filtered = someArray.filter(function(el) { return el.Name != "Kristian"; });

然而，你可以从一个Javascript库（例如underscore.js）中加入代码，为任何浏览器实现这一功能。

106

0

gabitzish

资料来源非AMP版本编辑

在数组上使用splice函数。指定起始元素的位置和你想删除的子序列的长度。

someArray.splice(pos, 1);

8

0

KooiInc · Accepted Answer · 2012-04-05T08:11:37+00:00

你可以使用几种方法从一个数组中删除项目。

//1
someArray.shift(); // first element removed
//2
someArray = someArray.slice(1); // first element removed
//3
someArray.splice(0, 1); // first element removed
//4
someArray.pop(); // last element removed
//5
someArray = someArray.slice(0, a.length - 1); // last element removed
//6
someArray.length = someArray.length - 1; // last element removed

如果您想移除位置为x的元素，请使用。

someArray.splice(x, 1);

或

someArray = someArray.slice(0, x).concat(someArray.slice(-x));

回复[@chill182][1]的评论：你可以使用Array.filter，或Array.splice结合Array.findIndex（见[MDN][2]）从数组中移除一个或多个元素，例如。

// non destructive filter > noJohn = John removed, but someArray will not change
let someArray = getArray();
let noJohn = someArray.filter( el => el.name !== "John" ); 
log("non destructive filter > noJohn = ", format(noJohn));
log(`**someArray.length ${someArray.length}`);

// destructive filter/reassign John removed > someArray2 =
let someArray2 = getArray();
someArray2 = someArray2.filter( el => el.name !== "John" );
log("", "destructive filter/reassign John removed > someArray2 =", 
  format(someArray2));
log(`**someArray2.length ${someArray2.length}`);

// destructive splice /w findIndex Brian remains > someArray3 =
let someArray3 = getArray();
someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1);
someArray3.splice(someArray3.findIndex(v => v.name === "John"), 1);
log("", "destructive splice /w findIndex Brian remains > someArray3 =", 
  format(someArray3));
log(`**someArray3.length ${someArray3.length}`);

function format(obj) {
  return JSON.stringify(obj, null, " ");
}

function log(...txt) {
  document.querySelector("pre").textContent += `${txt.join("\n")}\n`
}

function getArray() {
  return [ {name: "Kristian", lines: "2,5,10"},
           {name: "John", lines: "1,19,26,96"},
           {name: "Brian", lines: "3,9,62,36"} ];
}

<pre>
**Results**

</pre>