JavaScript打开页面后自动随机跳转页面

方案一

$(function(){
    //获取随机数
    var luckyNum = Math.round(Math.random()*3);
    //alert(luckyNum);
    if(luckyNum==0){window.location.href = "";}
    else if(luckyNum==1){window.location.href = "";}
    else if(luckyNum==2){window.location.href = "";}
    else if(luckyNum==3){window.location.href = "";}
})

方案二

$(function(){
    var arr = [1,2,3,4];
    var result = [];
    if(arr.length === 0){arr=result;result = [];}
    var num = arr.splice(Math.floor(Math.random()*arr.length),1);
    result = num.concat(result);
    alert(result[0]);
    var  luckyNum = result[0];
    //alert(luckyNum);
    if(luckyNum==1){window.location.href = "";}
    else if(luckyNum==2){window.location.href = "";}
    else if(luckyNum==3){window.location.href = "";}
    else if(luckyNum==4){window.location.href = "";}
})

方案三

$(function(){
    var count=4;
    var originalArray=new Array;//原数组 
    //给原数组originalArray赋值 
    for (var i=0;i<count;i++){originalArray[i]=i+1;}
    originalArray.sort(function(){return 0.5 - Math.random();});
    for(var i=0;i<count;i++){
        var luckyNum = originalArray[i]
        alert(luckyNum);
        if(luckyNum === 1){window.location.href = "";return;}
        else if(luckyNum === 2){window.location.href = "";return;}
        else if(luckyNum === 3){window.location.href = "";return;}
        else if(luckyNum === 4){window.location.href = "";return;}
    }
})

方案四

$(function(){
    var luckyNum = randUnique(1,4,1);
    alert(luckyNum);
    if(luckyNum == 1){window.location.href = "";}
    else if(luckyNum == 2){window.location.href = "";}
    else if(luckyNum == 3){window.location.href = "";}
    else if(luckyNum == 4){window.location.href = "";}
})

方案五

$(function(){
    //存储首次进入的随机数
    var globalNum = window.sessionStorage.getItem("skipNum",skipNum);
    var changeNum = Math.ceil(Math.random()*2);
    //alert("changeNum="+changeNum);
    if(changeNum == 1){
        var arr = [1,2];
        var skipNum = arr.splice(Math.floor(Math.random()*arr.length),1);
        //alert("skipNum="+skipNum);
        if(skipNum==1){window.location.href = "";}
        else if(skipNum==2){window.location.href = "";}
    }
    else if (changeNum == 2){
        var arr = [3,4];
        var skipNum = arr.splice(Math.floor(Math.random()*arr.length),1);
        //alert("skipNum="+skipNum);
        if(skipNum==3){window.location.href = "";}
        else if(skipNum==4){window.location.href = "";}
    }
})

方案六

$(function(){
    //存储首次进入的随机数
    var globalNum = window.sessionStorage.getItem("skipNum",skipNum);
    var firstArr = [1,2];
    var secondArr = [3,4];
    var skipNum = firstArr.splice(Math.floor(Math.random() * firstArr.length),1);
    // alert(skipNum);
    if(skipNum == globalNum){
    skipNum = secondArr.splice(Math.floor(Math.random() * secondArr.length),1);}
    globalNum = skipNum;
    window.sessionStorage.setItem("skipNum",skipNum);
    if(skipNum == 1){window.location.href = "";}
    else if(skipNum == 2){window.location.href = "";}
    else if(skipNum == 3){window.location.href = "";}
    else if(skipNum == 4){window.location.href = "";}
})

方案七

  var arr = new Array(
      "/lianjie1.html",
      "/lianjie2.html",
      "/lianjie3.html",
  );
  window.location.href = arr[Math.floor(Math.random() * arr.length)];

封装方法

/*
* 获取不重复随机数
* @param integer start 随机数最小值
* @param integer end 随机数最大值
* @param integer size 随机数获取数量 最小为1，默认1
* @return integer|array 如 1或者[2,4,7,9]
*/
function randUnique(start,end,size){
    var allNums = new Array;// 全部随机数值
    size = size ? (size > end - start ? end - start : size) : 1;// 判断获取随机数个数
    for (var i = start, k = 0; i <= end; i++, k++){allNums[k] = i;}// 生成随机数值区间数组
    allNums.sort(function(){return 0.5 - Math.random();});// 打撒数组排序
    return allNums.slice(0,size);// 获取数组从第一个开始到指定个数的下标区间
}