js输出单一字符字串

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<!DOCTYPE HTML><html><body>    <input type="text" id="str" >    <input type="button" value="click" onclick="test()"> </body></html><script>function test(){    //alert("123");    var str = document.getElementById("str").value;    if (str.length <= 1) {        alert(str);    } else {        var maxLen = 0;        var len = 1;        var maxCur = str[0];        var cur = str[0];        for (var i = 0; i < str.length - 1; i++) {            if (str[i] == str[i+1]) {                cur = str[i];                len ++;            } else {                len = 1;            }            if (len > maxLen) {                maxCur = cur;                maxLen = len;            };        };        var strLen = new Array(maxLen+1).join(maxCur);        alert(strLen);    };}</script>

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