Question

如何清空select里面的option

Answer 1

四种方法：（以下child指某select）1、循环将option赋值为null；function delAllItems(child){for(var i=child.options.length-1; i>=0; i--){child.options[i] = null;}}2、循环用remove将option删除掉function delAllItems(child){for(var i=child.options.length-1; i>=0; i--){child.remove(i);}}3、直接将innerHTML赋值""function delAllItems(child){child.innerHTML = ""; }4、直接将length赋值为0function delAllItems(child){child.options.length=0}