问从字母数字字符串中移除数值

EN

function filter(string){
     var result = string.replace(/\d/g,'')
     return result || string;
}

var newString = string.replace(/\d/g,'') || string;

var c1 = false, c2 = true, c3= false, c4 = true;
if( c1 || c2 || c3 || c4) {
}

var example = {
  'value' : {
     'sub_value' : 4
  }
}

var test = example && example.value && example.value.sub_value;
console.log(test) //4

var test_2 = example && example.no_exist && example.no_exist.sub_value;
console.log(test_2) //undefined


var test_3 = example.valno_existue.sub_value; //exception

function test_function(value){
   value = value || 4; //you can expecify default values
}

var s = "asd23asd";
if(/\w+/.test(s))
    s = s.replace(/\d+/g, '');

([a-zA-Z]+)\d+|\d+(?=[a-zA-Z]+)