javascript - 使用JavaScript从数组中删除对象(Remove Object from Array using JavaScript)

Question

How can I remove an object from an array?(如何从数组中删除对象？)

I wish to remove the object that includes name Kristian from someArray .(我希望从someArray删除包含名称Kristian的对象。) For example:(例如：) someArray = [{name:"Kristian", lines:"2,5,10"}, {name:"John", lines:"1,19,26,96"}]; I want to achieve:(我要实现：) someArray = [{name:"John", lines:"1,19,26,96"}];   ask by Clem translate from so

Answer 1

You can use several methods to remove item(s) from an Array:(您可以使用多种方法从数组中删除项目：)

//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 If you want to remove element at position x , use:(如果要删除位置x处的元素，请使用：) someArray.splice(x, 1); Or(要么) someArray = someArray.slice(0, x).concat(someArray.slice(-x)); Reply to the comment of @chill182 : you can remove one or more elements from an array using Array.filter , or Array.splice combined with Array.findIndex (see MDN ), eg(回复@ chill182的评论：您可以使用Array.filter或Array.splice与Array.findIndex组合（请参见MDN ）从数组中删除一个或多个元素，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>