6.html

<!DOCTYPE>
<html>
<head>
    <title>TEST</title>
</head>
<body>
<script>
// 我们怎么加载一个js？
function require(path, cb) {
    const script = document.createElement('script')
    script.src = path
    script.onload = function () {
        const factory = require.stack.shift()
        let module
        if (typeof factory === 'function') {
            module = factory()
        }
        module = factory
        require._[path] = module
        cb(module)
    }
    document.body.appendChild(script)
}
require._ = {}
require.stack = []

// 实现一个对应的define
function define(factory) {
    require.stack.push(factory)
}

require('./cases/6.require-no-name.js', function (mod) {
    console.log(mod())
})
</script>
</body>