In JavaScript, arrays are a powerful data type that allows you to store and manipulate collections of items. Sometimes, you may need to create a copy of an array for use in your code. There are a few different ways to create a copy of an array in JavaScript, depending on your needs ...
constshallowCopy=Object.assign({},simpleEvent)constshallowCopy=Object.create(simpleEvent) 但是一旦我们有了嵌套项,我们就会遇到麻烦: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 constcalendarEvent={title:"Builder.io Conf",date:newDate(123),attendees:["Steve"]}constshallowCopy={...calendarEvent...
Unfortunately, all of these create shallow copies, not deep ones.Shallow cloning in JavaScript # With a shallow copy, the original array or object is a unique copy, but any arrays or objects contained within it are actually just references to the original....
适用对象:Array 案例: constfamily=['father','mother','brother',['sister0','sister1','sister2'],];constcopyFamily=family.slice();copyFamily[0]='father1';copyFamily[3][1]='brother1';console.log(family);// ['father', 'mother', 'brother', ['sister0' , 'brother1', 'sister2']]c...
array:表示数组对象,用于存储多个值的有序集合。 function:表示函数对象,用于执行特定的任务。 date:表示日期和时间的对象。 regexp:表示正则表达式的对象,用于进行模式匹配。 原始类型在赋值时是按值传递的,每个变量都有自己的内存空间。而引用类型在赋值时是按引用传递的,多个变量指向同一个对象,修改一个变量会影响...
if (typeof prop === 'object') { obj[i] = (prop.constructor === Array) ? [] : Object.create(prop); } else { obj[i] = prop; } } return obj; } 直接使用var newObj = Object.create(oldObj),可以达到深拷贝的效果。 6. jquery 有提供一个$.extend可以用来做 Deep Copy。
arrayObj.splice(insertPos,0,[item1[, item2[, . . . [,itemN]]]); //将一个或多个新元素插入到数组的指定位置,插入位置的元素自动后移,返回""。 4. 数组元素的删除 1 2 3 4 5 6 arrayObj.pop();//移除最后一个元素并返回该元素值 array...
firstconstsecond=newMap([[1,"uno"],[2,"dos"],]);// Map 对象同数组进行合并时,如果有重复的键值,则后面的会覆盖前面的。constmerged=newMap([...first,...second,[1,"eins"]]);console.log(merged.get(1));// einsconsole.log(merged.get(2));// dosconsole.log(merged.get(3));// thre...
innerText = ''; Array.prototype.forEach.call(arguments, function (msg) { if (msg instanceof Error) { msg = "Error: " + msg.message; } else if (typeof msg !== 'string') { msg = JSON.stringify(msg, null, 2); } document.getElementById('results').innerHTML += msg + '\r\n...
To create a brand new copy of an array in its entirety, you can useArray.slice()with no arguments. varsandwichesCopy=sandwiches.slice(); The fancy new ES6 way# If you only need to copy an array, you can use theArray.from()method we talked about yesterday. ...