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var a = [
{"name":"小明","jifen":"2222"},
{"name":"小五","jifen":"33"},
{"name":"小六","jifen":"22322"},
{"name":"小七","jifen":"224422"},
{"name":"小八","jifen":"1"},
{"name":"小二","jifen":"55"},
];
<ul id="box"></ul>
<script type="text/javascript">
var a = [
{ "name": "小明", "jifen": "2222" },
{ "name": "小五", "jifen": "33" },
{ "name": "小六", "jifen": "22322" },
{ "name": "小七", "jifen": "224422" },
{ "name": "小八", "jifen": "1" },
{ "name": "小二", "jifen": "55" },
];
a.sort(function (a, b) { return b.jifen - a.jifen });
a = a.slice(0,3);
var str = "";
for (var i = 0; i < a.length; i++) {
str +="<li>"+a[i].name+":"+a[i].jifen+"</li>";
}
document.getElementById("box").innerHTML = str;
</script>
var a = [
{ "name": "小明", "jifen": "2222" },
{ "name": "小五", "jifen": "33" },
{ "name": "小六", "jifen": "22322" },
{ "name": "小七", "jifen": "224422" },
{ "name": "小八", "jifen": "1" },
{ "name": "小二", "jifen": "55" },
];
console.log(a.sort(function (a, b) { return b.jifen - a.jifen }).splice(0, 3));