还有一个不同就是fromIndex的默认值是array.length - 1而不是0.IE6等浏览器如下折腾:if (typeof Array.prototype.lastIndexOf != “function”) { Array.prototype.lastIndexOf = function (searchElement, fromIndex) { var index = -1, length =
arrayObj.splice(deletePos,deleteCount); //删除从指定位置deletePos开始的指定数量deleteCount的元素,数组形式返回所移除的元素 5、数组的截取和合并 复制代码代码如下: arrayObj.slice(start, [end]); //以数组的形式返回数组的一部分,注意不包括 end 对应的元素,如果省略 end 将复制 start 之后的所有元素 arra...
Element 类型就是 Web 开发中最常用的类型了。Element 表示 XML 或 HTML 元素,对外暴露出访问元素标签名、子节点和属性的能力。可以通过 nodeName 或 tagName 属性来获取元素的标签名。在 HTML 中,元素标签名始终以全大写表示;在 XML(包括 XHTML)中,标签名始终与源代码中的大小写一致。 HTML元素 所有HTML 元素...
{id:4,name:"sara"}];for(vari =0; i < users5.length; i++) {if(users5[i].name==="ted") {users5.splice(i,1);}}console.log("splice with specific value array of objects",JSON.stringify( users5));// [{"id":2,"name":"mike"},{"id":3,"name":"bob"},{"id":4,"name"...
Even the creator of Node.js Ryan Dahl asked this question from the audience during his Node.js presentation (an excellent one by the way).How do I remove an element from an array?Is the delete operator of any use? There also exists funny named splice() and slice(), what about those?
Based on the above code, if there were 10 input elements, clickinganyof them would display “This is element #10”! This is because, by the timeonclickis invoked foranyof the elements, the aboveforloop will have completed and the value ofiwill already be 10 (forallof them). ...
2. 构造函数Array() 调用时没有参数:创建一个没有任何元素的空数组,等同于数组直接量arrayObject。 调用时有一个数值参数:创建指定长度的数组,参数即长度。生成的数组都是稀疏数组。 显式指定两个或多个数组元素或者数组的一个非数值元素:以这种形式,构造函数的参数将会成为新数组的元素。使用数组字面量比这样使用...
vara=newArray(5);//数组没有元素,但a.length等于5varb=[]; b[1000] =1000;//添加一个索引为1000的元素,但b.length等于1001 通过delete操作符删除数组元素可产生稀疏数组。delete不会改变数组长度,高位置索引元素也不会下移填补删除索引位置的空白。
value, ... Zero or more values to be inserted intoarray, beginning at the index specified bystart. Returns An array containing the elements, if any, deleted fromarray. Description splice( )deletes zero or more array elements starting with and including the elementstartand replaces them with ...
Example 2: Using splice() for different deleteCount values If start > array.length, splice() does not delete anything and starts appending arguments to the end of the array. If start < 0, the index is counted from backward (array.length + start). For example, -1 is the last element....