將字符串中下划線去掉並把下划線后面的首字母改為大寫 如：ba_cd_sa 改為baCdSa

splitDownLineandAfterToUpperCase(str) {

var s = str.split('_');

var newA="";

for(var i=1;i<s.length;i++){

newA += s[i].substring(0, 1).toUpperCase() + s[i].substring(1);

}

return newA =s[0]+newA;

},