微件:External demands

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if (elements.length == 0) {
    const externalDemandShell = document.getElementById('external_demand_shell');
    externalDemandShell.remove();
} 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);
	    element.remove();
	    if (!cats.has(clone.title)) {
	    	cats.set(clone.title,new Array());
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    	clone.style.display = 'inline';
	    clone.classList.remove('external_demand_span');
	}

	function handler(value, key, map) {
    	const p = document.createElement('p');
    	p.innerText = '来自' + key + '的条目：';
    	appendTo.appendChild(p);
    	const duplicates = new Map();
    	const displayed = new Map();
    	const ul = document.createElement('ul');
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        	    	duplicatedUl.appendChild(duplicatedLi);
        	    	duplicates.get(externalTarget).appendChild(duplicatedUl);
        	    	displayed.get(externalTarget).push(displayName);
        	    }
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        	    const li = document.createElement('li');
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        		displayed.set(externalTarget, [displayName]);
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        		ul.appendChild(li);
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	    appendTo.appendChild(ul);
	}

	cats.forEach(handler);
}
</script>