javascript无法正常使用forloop吗?

时间:2016-12-02 17:13:26

标签: javascript function date colors

我正在制作一个事件列表,其日期转换为事件发生的天数。我希望活动有不同的颜色,更多的是更红,更接近一个更绿。 days是整数值,我事先检查它是否为null或低于0然后它是0.由于某种原因,有时某些事件会跳过此函数。

这个getTimeAndColorForElement()是列表中每个元素的内部循环。

function getTimeAndColorForElement(time, element){
  //time can be ISO 8601-format
  var t = Date.parse(time) - Date.parse(new Date());
  var minutes = Math.floor( (t/1000/60) % 60 );
  var hours = Math.floor( (t/(1000*60*60)) % 24 );
  var days = Math.floor( t/(1000*60*60*24) );

  if(!days || days < 0){
      days = 0;
  }
  var color = getColor(days);
  $(element).css('color', color);

  //... then sets days, hours mins and so on..

}

调用此函数来获取颜色..

function getColor(days) {

      var red = 0;
      var green = 250;
      var blue = 0;

      //set color more red the more days there is
      for(i = 0; i < days; i++) {
          green -= 15;
          red += 15;
      }

      //keeping it in 0-255 color values.
      if(green < 0) {
          green = 0;
      }
      if(red < 0) {
          red = 0;
      }
      if(blue < 0) {
          blue = 0;
      }
      if(green > 250) {
          green = 250;
      }
      if(red > 250) {
          red = 250;
      }
      if(blue > 250) {
          blue = 250;
      }

      //color in rgb
      var color = "'rgb(" + red + "," + green + "," + blue + ")'";

      return color;
}

1 个答案:

答案 0 :(得分:3)

为什么你不这样做:

var colorStep = 15,
    red       = colorStep * days,
    green     = 250 - colorStep * days,
    blue      = 0;

...