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AC了

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jaychang87

#1 Created at ... [Delete] [Delete and Lock User] 
    var parent = document.getElementById("test-list");
    var p = parent.firstElementChild;
    while(p != null){
        var lang = p.innerText;
        if(lang !== "JavaScript" && lang !== "HTML"  && lang !== "CSS"){
            var temp = p;
            p = p.nextElementSibling;
            parent.removeChild(temp);
            continue;
        }
        p = p.nextElementSibling;
    }

SK_2B

#2 Created at ... [Delete] [Delete and Lock User] 
var parent = document.getElementById("test-list");
    var p = parent.firstElementChild;
    while(p != null){
        var lang = p.innerText;
        var next = p.nextElementSibling;
        if(lang !== "JavaScript" && lang !== "HTML"  && lang !== "CSS"){
            parent.removeChild(p);
        }
        p = next;
    }
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