js函数调用函数无效

function ftalk(kindOfPet) {     if(kindOfPet == "dog")     {         document.writeln("bow-wow!");     }     else    {         if(kindOfPet == "cat")         {             document.writeln("meow-meow-meow");         }     } }       function pet(inputName, inputKind, inputColor) {     this.name = inputName;     this.kind = inputKind;     this.color = inputColor;     this.talk = ftalk(inputkind); }   var Boots = new pet("Boots", "cat", "orange striped"); Boots.talk;

function pet(inputName, inputKind, inputColor) {     this.name = inputName;     this.kind = inputKind;     this.color = inputColor;     this.talk = ftalk(inputKind);  // 此处 inputkind 的 k 改为大写, 要仔细 - - }