微件:External demands

const elements = document.getElementsByClassName('external_demand_span');

if (elements.length == 0) {
    const externalDemandShell = document.getElementById('external_demand_shell');
    externalDemandShell.style.display = 'none';
} else {
	const appendTo = document.getElementById('external_demand');

	const cats = new Map();

	for (let i = 0; i < elements.length; i++) {
	    const element = elements[i];
	    const clone = element.cloneNode(true);
	    console.log(clone.title);
	    if (!cats.has(clone.title)) {
	    	cats.set(clone.title,new Array());
    	}
    	cats.get(clone.title).push(clone);
    	clone.style.display = 'inline';
	    clone.classList.remove('external_demand_span')
	}

	function handler(value, key, map) {
    	console.log(key);
    	console.log(value);
    	const p = document.createElement('p');
    	p.innerText = '来自' + key + '的条目：';
    	appendTo.appendChild(p);
    	const ul = document.createElement('ul');
    	value.forEach((s) => {
        	const li = document.createElement('li');
        	li.appendChild(s);
        	ul.appendChild(li);
    	})
	    appendTo.appendChild(ul);
	}

	cats.forEach(handler);
}