小编Kat*_*ler的帖子

我想知道是否有更有效的方法来编写案例循环。

$search = "ORDER BY CASE WHEN created_by = :created_by THEN -1                                             
           WHEN cat_id = 24  THEN -1 
           WHEN cat_id = 26  THEN -1 
           ELSE created_at END LIMIT :limit, :perpage";

我怀疑是否

WHEN cat_id = 24  THEN -1 
WHEN cat_id = 26  THEN -1 

可能

WHEN cat_id = IN(24,26) THEN -1

如果不是，我该怎么办？我必须做某种for循环吗？

我正在尝试从半径和 x,y 坐标制作一个圆。除了数组不是我使用的正确格式之外，我已经完成了所有操作。我得到：

[
    "X_PROPS:40,Y_PROPS:0",
    "X_PROPS:39.99390780625565,Y_PROPS:0.6980962574913405",
    "X_PROPS:39.97563308076383,Y_PROPS:1.3959798681000388",
    "X_PROPS:39.94518139018295,Y_PROPS:2.093438249717753"
]

但是我需要：

[
    {X_PROPS:40,Y_PROPS:0},
    {X_PROPS:39.99390780625565,Y_PROPS:0.6980962574913405},
    {X_PROPS:39.97563308076383,Y_PROPS:1.3959798681000388},
    {X_PROPS:39.94518139018295,Y_PROPS:2.093438249717753}
]

我试过这个：

function spec(radius, steps, centerX, centerY){
  var xValues = [centerX];
  var yValues = [centerY];
  var result = [];
  for (var i = 0; i < steps; i++) {
    xValues[i] = (centerX + radius * Math.cos(2 * Math.PI * i / steps));
    yValues[i] = (centerY + radius * Math.sin(2 * Math.PI * i / steps));

    result.push('X_PROPS:'+ xValues[i]+','+'Y_PROPS:'+ yValues[i]);
  }

  return result;

}
console.log(spec(40,360,0,0))