Color string conversion (regular)

Topic description

Convert the rgb color string to hexadecimal form, such as rgb(255, 255, 255) to #ffffff
1. The number of spaces after each in rgb is not fixed
2. The hexadecimal expression uses six 3. If the input is not in rgb format, return the original input

code

 

1  function rgb2hex(sRGB) {
 2      var rgb = /rgb\((\d+)\s*,\s*(\d+)\s*,\s*(\d+)\)/ ;
 3      var rgbArr = sRGB .match(rgb); // rgbArr = {rgb(255, 255, 255),255,255,255} 
4      /* var rgb = /rgb\((\d+)\s*,\s*(\d+)\s* ,\s*(\d+)\)/g 
 5      //rgb = {rgb(255, 255, 255)} */ 
6      var str = "#";   // color value 
7      if (!rgbArr){   // Does not match regular match 
8          return sRGB;
 9      }
 10      else {
 11          for ( vari = 1 ; i<4; i++ ){
 12              var rgbIndex = parseInt(rgbArr[i]);
 13              if (rgbIndex<16 && rgbIndex>=0 ){
 14                  str += ('0'+rgbIndex.toString(16 )); // keep two digits 
15              }
 16              else  if (rgbIndex>=16 && rgbIndex<=255 ){
 17                  str += rgbIndex.toString(16 );
 18              }
 19              else {
 20                  return sRGB;   // not a color value character 
21              }
 22          }
 23         return str;
24     }
25 }

Source: Niuke.com