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var to = document.to.title.value.toString();
应该
var to = document.to.tit.value.toString();
但是，正如您所指出的，某些浏览器仍然不满意。Opera 不喜欢表单名称是to，因此将其更改为toForm并更新您的代码会使 Opera 再次高兴。
to
toForm