User:机智的小鱼君/common.js

mw.loader.load('https://common.wjghj.cn/js/InPageEdit-v2');

      function getArrItem(arr, num) {
          var temp_array = new Array();
          for (var index in arr) {
              temp_array.push(arr[index]);
          }
          var return_array = new Array();
          for (var i = 0; i < num; i++) {
              if (temp_array.length > 0) {
                  var arrIndex = Math.floor(Math.random() * temp_array.length);
                  return_array[i] = temp_array[arrIndex];
                  temp_array.splice(arrIndex, 1);
              } else {
                  break;
              }
          }
          return return_array;
      }

var a = ['this is 1','this is 2','this is 3'];
alert( 'now random: '+ getArrItem(a,1) );