1 # 应用于替换对象 2 function People(name, age){ 3     this.name = name; 4     this.age = age;  5 } 6  7 function Worker(name, age, job){ 8     People.apply(this, arguments); 9     this.job = job10 }11 12 var worker = new Worker(‘小明‘, 23, ‘coder‘);13 14 worker.name #=> ‘小明‘;15 worker.age #=> 23;16 worker.job #=> ‘coder‘; 17 18 # 应用于平铺数组参数19 20 var a = [1,2,3],21     b = [4,5];22 23 Array.prototype.push.apply(a, b); #=> a = [1, 2, 3, 4, 5]24 25 a.push(b); #=> a = [1, 2, 3, [4,5]]26 27 Math.math(null, [1,2,3,4,5]) #=> 5