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判斷一個字串中出現次數最多的字元，並統計次數//hash table方式
var s = ‘aaabbbcccaaabbbaaa‘;var obj = {};var maxn = -1;var letter;for(var i = 0; i < s.length; i++) { if(obj[s[i]]) { obj[s[i]]++; if(obj[s[i]] > maxn) { maxn = obj[s[i]]; letter = s[i]; } } else { obj[s[i]] = 1; if(obj[s[i]] > maxn) { maxn = obj[s[i]]; letter = s[i]; } }}alert(letter + ‘: ‘ + maxn);
//正則方式
var s = ‘aaabbbcccaaabbbaaabbbbbbbbbb‘;var a = s.split(‘‘);a.sort();s = a.join(‘‘);var pattern = /(\w)\1*/g;var ans = s.match(pattern);ans.sort(function(a, b) { return a.length < b.length;});;console.log(ans[0][0] + ‘: ‘ + ans[0].length);
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//domvar lis = document.links; for(var i = 0, length = lis.length; i < length; i++) { lis[i].index = i; lis[i].onclick = function() { alert(this.index); }; }
//閉包var lis = document.links; for(var i = 0, length = lis.length; i < length; i++) { (function(i) { lis[i].onclick = function() { alert(i + 1); }; })(i);
請編寫一個JavaScript函數 parseQueryString，它的用途是把URL參數解析為一個對象，如： var url = “http://witmax.cn/index.php?key0=0&key1=1&key2=2″
function parseQueryString(url) { var obj = {}; var a = url.split(‘?‘); if(a.length === 1) return obj; var b = a[1].split(‘&‘); for(var i = 0, length = b.length; i < length; i++) { var c = b[i].split(‘=‘); obj[c[0]] = c[1]; } return obj;}var url = ‘http://witmax.cn/index.php?key0=0&key1=1&key2=2‘;var obj = parseQueryString(url);console.log(obj.key0, obj.key1, obj.key2); // 0 1 2
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