为什么此代码在控制台读取中引发错误TypeError: pizzaBox.querySelector is not a function. (In 'pizzaBox.querySelector('h6')', 'pizzaBox.querySelector' is undefined)？
function addToppingsToAll (toppings)
{
var pizzaBoxHolder = document.getElementById("PizzaBoxHolder");
var PizzaBoxList = pizzaBoxHolder.childNodes;
for ( var i = 0 ; i < pizzaBoxList.length ; i++ )
{
var pizzaBox = pizzaBoxList[i];
toppingList = pizzaBox.querySelector('h6');
toppingList.textContent = "You have " + toppings " on your pizza";
}
}
您的代码中至少有三个问题：
.querySelector()方法的文本节点。for循环迭代变量ilineBoxList试图使用的未声明变量。您可以通过仅使用.querySelectorAll()并让选择器为您完成更多工作来简化事情。
function addToppingsToAll (toppings) {
var toppingItems = document.querySelectorAll("#PizzaBoxHolder h6");
for (var i = 0; i < toppingItems.length; i++) {
toppingItems[i].textContent = "You have " + toppings " on your pizza";
}
}
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