优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

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exports.removeElement = function(elem){
    if(elem.prev) elem.prev.next = elem.next;
    if(elem.next) elem.next.prev = elem.prev;
 
    if(elem.parent){
        var childs = elem.parent.children;
        childs.splice(childs.lastIndexOf(elem), 1);
    }
};
 
exports.replaceElement = function(elem, replacement){
    var prev = replacement.prev = elem.prev;
    if(prev){
        prev.next = replacement;
    }
 
    var next = replacement.next = elem.next;
    if(next){
        next.prev = replacement;
    }
 
    var parent = replacement.parent = elem.parent;
    if(parent){
        var childs = parent.children;
        childs[childs.lastIndexOf(elem)] = replacement;
    }
};
 
exports.appendChild = function(elem, child){
    child.parent = elem;
 
    if(elem.children.push(child) !== 1){
        var sibling = elem.children[elem.children.length - 2];
        sibling.next = child;
        child.prev = sibling;
        child.next = null;
    }
};
 
exports.append = function(elem, next){
    var parent = elem.parent,
        currNext = elem.next;
 
    next.next = currNext;
    next.prev = elem;
    elem.next = next;
    next.parent = parent;
 
    if(currNext){
        currNext.prev = next;
        if(parent){
            var childs = parent.children;
            childs.splice(childs.lastIndexOf(currNext), 0, next);
        }
    } else if(parent){
        parent.children.push(next);
    }
};
 
exports.prepend = function(elem, prev){
    var parent = elem.parent;
    if(parent){
        var childs = parent.children;
        childs.splice(childs.lastIndexOf(elem), 0, prev);
    }
 
    if(elem.prev){
        elem.prev.next = prev;
    }
    
    prev.parent = parent;
    prev.prev = elem.prev;
    prev.next = elem;
    elem.prev = prev;
};