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Math.random() 0 () 1 ( 1)

random(min, max), min max ( max).

          alert( random(1, 5) ); // 1.2345623452
alert( random(1, 5) ); // 3.7894332423
alert( random(1, 5) ); // 4.3435234525
        

01 min max.

2 :

function random(min, max) {
  return min + Math.random() * (max - min);
}

alert( random(1, 5) );
alert( random(1, 5) );
alert( random(1, 5) );

min max