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为什么这个不对啊

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var s=document.getElementsByClassName('lang');

var m=[];

for (var p in s) {

    m.push(p.innerText);

}

m.sort();

var 

    list=document.getElementById("test-list"),

    haskell = document.createElement('li');

haskell.class= 'lang';

for (var b in m){

haskell.innerText = b;

list.appendChild(haskell);

}


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