原因猜想：使用html-loader加载了两次html
比如，错误示例：
module: { rules: [ // all files with a '.ts' or '.tsx' extension will be handled by 'ts-loader' {test: /\.ts$/, loader: "ts-loader"}, {test: /\.(html)$/, loader: "html-loader"}, {test: /\.html/, loader: "html-loader"} ] },则在代码中看到require('./yunzhi.html')时。首先，由于符合第一条 {test: /\.(html)$/, loader: "html-loader"},则将html编译为变量A -> (module.exports)；然后，由于再次符合第二条规则{test: /\.html/, loader: "html-loader"}，又重新将A进行了二次编译，然后就出现了我们不想看到的。
例子
a.html
<yunzhi></yunzhi>yunzhi组件
app.component('yunzhi', { template: require('./yunzhi.html') ...});yunzhi.html
<h1>hello</h1><h2>hello</h2>则发生如下错误：
解决方案
删除冗余的loader
删除前：
module: { rules: [ // all files with a '.ts' or '.tsx' extension will be handled by 'ts-loader' {test: /\.ts$/, loader: "ts-loader"}, {test: /\.(html)$/, loader: "html-loader"}, {test: /\.html/, loader: "html-loader"} ] },删除后：
module: { rules: [ // all files with a '.ts' or '.tsx' extension will be handled by 'ts-loader' {test: /\.ts$/, loader: "ts-loader"}, {test: /\.(html)$/, loader: "html-loader"}, ] },