"Uncaught TypeError: Failed to execute ‘setAttribute‘ on ‘Element‘: 2 arguments required, but only 1 present."意思是setAttribute需要传入两个参数，但仅传入一个。该错误是由于setAttribute里传入的参数不全或者错误导致。
<body>
<div class="contain">
<div class="shop">
</div>
<div class="button copy">
<input type="checkbox" />
<label>全选</label>
<label>总价：<span id="allPrice">0</span>元</label>
<label>结算：<span>0</span>元</label>
</div>
</div>
</body>
shopContain = document.getElementsByClassName("shop")[0];//shop节点
subBtn=document.getElementsByClassName(‘sub‘);//sub按钮节点（通过拼接字符串添加）
var arrObj = [
{
shopName:"钻石",
shopImg:"img/hot1.jpg",
shopPrice:1000,
shopCount:1,
},
{
shopName:"黄金",
shopImg:"img/hot1.jpg",
shopPrice:2000,
shopCount:1,
}
]
//拼接字符
for (var i = 0; i < arrObj.length; i++) {
var itemObj=arrObj[i];
var chcked =‘<input type="checkbox" />‘;
var shopNameStr = "<label>商品名称："+itemObj["shopName"]+"</label>";
var shopImgStr = "<label><img src="+itemObj["shopImg"]+"></label>"
var shopPriceStr = "<label>价格：<span>"+itemObj["shopPrice"]+"元</span></label>";
var shopCountStr = ‘<label>数量：<button class="sub" disabled="disabled" >-</button><span>‘+itemObj["shopCount"]+‘个</span><button class="add">+</button></label>‘;
var divStr = "<div>"+chcked+shopNameStr+shopImgStr+shopPriceStr+shopCountStr+"</div>";
shopContain.innerHTML+= divStr;
}
for (var i = 0; i < subBtn.length; i++) {
subBtn[i].onclick=sub;
console.log(subBtn[i])
//对于自定义的属性，应该通过setAttribute方法来添加到元素节点中，否则就无法获取该属性，要想获取自定义属
//性的值，应该在setAttribute(参数1，参数2)中传入参数2的值(注：参数1：自定义的属性，参数2：给自定义属
//性设置的值),这样才能subBtn.index，获取自定义属性index的值，可以写成以下写法
subBtn[i].setAttribute("index",i)
subBtn.index=i
addBtn[i].onclick=add;
}
Uncaught TypeError: Failed to execute 'setAttribute'（setAttribute定义属性错误）
原文：https://www.cnblogs.com/peng-blogs/p/14586311.html