var str = 'abcdefgaaaa'; while (str.indexOf('a') !== -1) { str = str.replace('a', '!'); } console.log(str);
转大写
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var str = 'get-Element-By-Id'; console.log(str.toUpperCase()); 返回结果为 :get-element-by-id
转小写
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var str = 'get-Element-By-Id'; // console.log(str.toUpperCase()); var arr = str.split('-'); var a = arr[0]; for (var i = 1; i < arr.length; i++) { a += arr[i].charAt(0).toLowerCase() + arr[i].slice(1); } console.log(a) 返回结果为 :getelementbyid