be harmful to和be harmful for 有何区别?

be harmful for后面接名词,多是人或物,如Eating junk food is harmful for you.
be harmful to 意思是“对......有害”。例如：chemicals that are harmful to the environment 对环境有害的化学品 （摘自《朗文高级英语应试词典》英汉双解）,后面接动词,如It is harmful to eat junk food.
be harmful for+doing 或事物
be harmful to+sb
在某些情况可以通用.
be harmful (to ) (对……)有害
例1：Smoking is harmful to your health. 吸烟有害于你的健康。
例2：Reading in bed is harmful to your eyesight. 躺在床上看书对你的视力有害。
例3：It can help stabilize the situation, and for a long time too, and is harmful to neither side.这样能向人民交代，局势可以稳定，并且是长期稳定，也不伤害哪一方。
例4：If we are weak and irresolute, if we are tolerant and indulgent, it will bring harm to the people and alienate us from the masses如果我们优柔寡断，姑息养奸，则将遗祸人民，脱离群众。
例5：If we are weak and irresolute, if we are tolerant and indulgent, it will bring harm to the people and alienate us from the masses.如果我们优柔寡断，姑息养奸，则将遗祸人民，脱离群众。
例6：When the four weasels felt that they were free from harm they walked toward the chicken coop这四只黄鼠狼觉得后顾无忧，就朝着鸡圈走去。
例7：I told her if she did me any harm I would return tit for tat.我告诉她，如果她伤害我，我会对她以牙还牙。

be harmful for后面接名词，多是人或物，如Eating junk food is harmful for you.
be harmful to 后面接动词，如It is harmful to eat junk food.