javascript - How to use break to control the loop so that the values ​​of console.log(sum) are different

Question

var a = [1, 2, 3, 4, 5, 6, 7, 8];
sum = [];
array = parseInt(10 * Math.random());

for (var j = 0; j < 3; j++) {
    for (var i = 0; i < a.length; i++) {

       
        sum[i] = a[i];


        if (i == array) {
            break
        };

    }

    console.log(sum);
}

 

Answer 1

break can be removed...

let arr = [1, 2, 3, 4, 5, 6, 7, 8]
let result = []

for (let i = 0; i < arr.length - 1; i++) {
  // 每次循环重置 result
  result = []
  for (let j = 0; j < arr.length; j++) {
    result.push(arr[j])
    if (j >= i) break
  }
  console.log(result)
}

Answer 2

The juli[b] in the loop cannot be added to the array correctly every time

If the conditions are met, I will use break to interrupt

If the subscript obtained by acc reaches 5, sum the first 1234 and so on

                for (var a = 0; a < cresult.length; a++) {

                    for (var i = 1, j = 0; i < arr.length; i++, j++) {

                        result[j] = [countDisPoToLine(cresult[a]["2"], cresult[a]["1"], arr[j]["2"], arr[j]["1"], arr[i]["2"], arr[i]["1"]), arr[i]["1"], arr[i]["2"], arr[j]["1"], arr[j]["2"], arr[j]["0"], lineDis(arr[i]["1"], arr[i]["2"], arr[j]["1"], arr[j]["2"])];

                        arrjoin[j] = result[j][0]; //循环数组中第一组关于距离的值

                        juli[j] = result[j][6];
                        
                    }
                    //console.log(juli); 
                    mindis = Math.min.apply(Math, arrjoin); //
                    //console.log(arrmin.length, "点距线最短距离");
                    console.log(mindis, "点距线最短距离");
//result = [];
                    for (var b = 0; b < result.length; b++) {
                        ///sum = lineDis(result[b][1],result[b][2],result[b][3],result[b][4]); //计算两点之间的长度

                        acc = isHasElementTwo(arrjoin, mindis); //查找item 在array中的下标位置
                        
                        
                       sum.push(juli[b]);        
                    //console.log(juli[b]);     
   //console.log(sumb(acc,juli));
                        if (b == acc) //满足最近点下标的条件，连续相加产生连续里程。
                        {

                            minxy = getPointOnPolyline(cresult[a]["2"], cresult[a]["1"], result[b][4], result[b][2], result[b][3], result[b][1]);

                            ctt = lineDis(result[b][3], result[b][4], minxy[1], minxy[0]);

                            console.log(minxy, "垂足坐标");

                            console.log(ctt, "距离最近点的距离");

                            break
                        };

                    }
        
                    //abc.push(sum );
                    //console.log(eval(abc.join("+")));
                    console.log(sum);

                }
                
  

**1.0374510479565615 "The shortest distance between the point and the line" (index):84
[736260.8899769672, 1411419.6883407037] "The vertical coordinates" (index):102
17.38691589480421 "The distance from the nearest point" (index ):104
[13.999781212443958, 54.4198045292843 70.38912223496114 880968758, 646.6167989543939, 313.57803581242166, 1067.5293031990727, 958.2300622502552, 417.420483917605, 64.57688332512566 , 216.4881564657956, 316.1135609002259, 81.2835112492013, 56.39033259343886, 561.7188548465188, 142.39781082935613, 893.5690 953081938, 92.02929710155902, 16.993059288952495, 14.314772824074824, 14.785963614054475, 20.720394204841156, 29.40872826215661, 22.45736237849337, 19.645029625828716, 28.46256518660203, 41.71105215644795, 18.333020182101933, 16.940 88291682246, 32.23066924532746, 14.250265576472243, 204.50641699722792, 20.740160172962312, 24.035660943608878, 13.999781212 62 .58699880968758, 646.6167989543939, 313.57803581242166, 1067.5293031990727, 958.2300622502552, 417.420483917605, 142.39781 082935613, 893.5690953081938, 92.02929710155902, 16.993059288952495, 14.314772824074824, 14.785963614054475, 20.720394204841 156. 94088291682246, 32.23066924532746, 14.250265576472243, 204.50641699722792, 20.740160172962312, 13.999781212443958, 54.4198045292843 70.38912223496114 880968758, 646.6167989543939, 313.57803581242166, 1067.5293031990727, 958.2300622502552, 417.420483917605, 64.57688332512566 , 216.4881564657956, 316.1135609002259, 81.2835112492013, 56.39033259343886, 561.7188548465188, 142.39781082935613, 893.5690 953081938, 92.02929710155902, 16.993059288952495, 14.314772824074824, 14.785963614054475]**