js字符串驼峰命名

用js将test_medol转成testMedol的驼峰形式

var testMedol = 'test_medol';

function exchangeString(str,spilt){var arr=str.split(spilt);for(var i=0;i<arr.length;i++){if(i==0){arr[i] = arr[i].toLowerCase();}else{arr[i]=arr[i].charAt(0).toUpperCase()+arr[i].substring(1).toLowerCase();}}return arr.join("");};

testMedol  = exchangeString(testMedol ,'_');