ajax 异步请求后台返回字符串赋值给js参数

function getText(){
var c = $.ajax({
url:'ajax/getText.action',
dataType: 'text',
type:'post',
async: false,
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert(XMLHttpRequest.status+"  "+XMLHttpRequest.readyState+"  "+textStatus);
},
success: function(text){
return text;
}
});
return c.responseText;
}