等价的写法

方法一：<a href="javascript:void(0)" onclick="javascript:方法;">提交</a> 
方法二：<a href="#" onclick="javascript:方法;return false;">提交</a> 

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var t=((window.getSelection&&window.getSelection())||(document.getSelection&&document.getSelection())||(document.selection &&document.selection.createRange&&document.selection.createRange().text));
var e=(document.charset||document.characterSet);
alert('页面选择的字符是：'+t);
alert('页面的字符编码是：'+t);

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document.selection.type 返回三个值 "None" "Text" "Control"
只有当返回值是 Text 时，创建的textRange才是有效的。