for(var i=1;i<=3;i++){
var obj = document.getElementById("text" + i);
if(obj == null){
continue;
}
obj.value = "";
obj.disabled = true;
}//for(var i=1;i<=3;i++){
var obj = document.getElementById("text" + i);
if(obj == null){
continue;
}
var parentNode = obj.parentNode;
parentNode.removeChild(obj);
}
var obj = document.getElementById("text" + i);
if(obj == null){
continue;
}
obj.value = "";
obj.disabled = true;
}//for(var i=1;i<=3;i++){
var obj = document.getElementById("text" + i);
if(obj == null){
continue;
}
var parentNode = obj.parentNode;
parentNode.removeChild(obj);
}
var parentNode = obj.parentNode;
parentNode.removeChild(obj);为什么不直接写成 obj.parentNode.removeChild(obj); 呢?