【js学习笔记十一】前端数组方法splice

前言

    我是歌谣 我有个兄弟 巅峰的时候排名c站总榜19 叫前端小歌谣 曾经我花了三年的时间创作了他 现在我要用五年的时间超越他 今天又是接近兄弟的一天人生难免坎坷 大不了从头再来 歌谣的意志是永恒的 放弃很容易 但是坚持一定很酷

导语

    前端数组方法splice的使用

 代码部分

     //splice(start,end,index1,index2) 从什么位置开始，删几个？删了后插入什么新元素？
        var geyao=["1","2","3","4"]
        var geyaotest=["1","2","3","4"]
        var geyaofangfang=["1","2","3","4"]
        var fangfang=["1","2","3","4"]
        var fangfangTest=["1","2","3","4"]
        var fangfangBang=["1","2","3","4"]
        var kangkang=["1","2","3","4"]
        var kangkangni=["1","2","3","4"]
        var kangkanghao=["1","2","3","4"]
        //1个参数会截取当前 大于2之后的数都会被删除
        geyao.splice(2)
        console.log(geyao,"geyao")//["1","2"]
        //2个参数 表示从什么位置截取到什么位置 把下标为2的截取掉
        geyaotest.splice(2,1)
        console.log(geyaotest,"geyaotest") //[ "1", "2", "4" ]
        //3个参数 在什么位置到什么位置添加
        geyaofangfang.splice(2,1,"5")
        console.log(geyaofangfang,"geyaofangfang") //[ "1", "2", "5", "4" ]
        //超出数组长度 默认获得前面的全部
        fangfang.splice(5)
        console.log(fangfang,"fangfang") // [ "1", "2", "3", "4" ]
        //从5之后开始截取
        fangfangTest.splice(5,1)
        console.log(fangfangTest,"fangfangTest") // [ "1", "2", "3", "4" ]
        //对后置的位置进行添加
        fangfangBang.splice(5,1,"6")
        console.log(fangfangBang,"fangfangBang") // [ "1", "2", "3", "4","6"]
        //倒着开始截取剩余部分
        kangkang.splice(-1)
        console.log(kangkang,"kangkang") // [ "1", "2", "3" ]
        //倒着进行处理
        kangkangni.splice(-2,1)
        console.log(kangkangni,"kangkangni")//[ "1", "2", "4" ]
        //倒着插入对应值
        kangkanghao.splice(-2,1,"8")
        console.log(kangkanghao,"kangkanghao")//[ "1", "2", "8", "4" ]
        //该方法向或者从数组中添加或者删除项目，返回被删除的项目。（该方法会改变原数组）

总结

    //该方法向或者从数组中添加或者删除项目，返回被删除的项目。（该方法会改变原数组）