把全角数值替换成半角

function tot(mobnumber){
while(mobnumber.indexOf("０")!=-1){
mobnumber = mobnumber.replace("０","0");
}
while(mobnumber.indexOf("１")!=-1){
mobnumber = mobnumber.replace("１","1");}
while(mobnumber.indexOf("２")!=-1){
mobnumber = mobnumber.replace("２","2");}
while(mobnumber.indexOf("３")!=-1){
mobnumber = mobnumber.replace("３","3");}
while(mobnumber.indexOf("４")!=-1){
mobnumber = mobnumber.replace("４","4");}
while(mobnumber.indexOf("５")!=-1){
mobnumber = mobnumber.replace("５","5");}
while(mobnumber.indexOf("６")!=-1){
mobnumber = mobnumber.replace("６","6");}
while(mobnumber.indexOf("７")!=-1){
mobnumber = mobnumber.replace("７","7");}
while(mobnumber.indexOf("８")!=-1){
mobnumber = mobnumber.replace("８","8");}
while(mobnumber.indexOf("９")!=-1){
mobnumber = mobnumber.replace("９","9");}

return mobnumber;
}