JS - 获取页面上选中的文字
说明：在一些特殊应用中，我们需要获取页面上选中的文字，但是要实现这一需求，我们不得不面对那恼人的兼容问题，本文介绍了一个兼容性较好的解决方法。同时，也提供了一个在 FireFox 下获取 input 和 textarea 中选中文字的解决方案。
1 function getSelectedText() {
2 if (window.getSelection) {
3 // This technique is the most likely to be standardized.
4 // getSelection() returns a Selection object, which we do not document.
5 return window.getSelection().toString();
6 }else if (document.getSelection) {
7 // This is an older, simpler technique that returns a string
8 return document.getSelection();
9 }else if (document.selection) {
10 // This is the IE-specific technique.
11 // We do not document the IE selection property or TextRange objects.
12 return document.selection.createRange().text;
13 }
14 }
2 if (window.getSelection) {
3 // This technique is the most likely to be standardized.
4 // getSelection() returns a Selection object, which we do not document.
5 return window.getSelection().toString();
6 }else if (document.getSelection) {
7 // This is an older, simpler technique that returns a string
8 return document.getSelection();
9 }else if (document.selection) {
10 // This is the IE-specific technique.
11 // We do not document the IE selection property or TextRange objects.
12 return document.selection.createRange().text;
13 }
14 }
在 FireFox 下获取 input 或者 textarea 中选中的文字，可以用下面的方法：
1 function getTextFieldSelection(e) {
2 if (e.selectionStart != undefined && e.selectionEnd != undefined) {
3 var start = e.selectionStart;
4 var end = e.selectionEnd;
5 return e.value.substring(start, end);
6 }else return ""; // Not supported on this browser
7 }
2 if (e.selectionStart != undefined && e.selectionEnd != undefined) {
3 var start = e.selectionStart;
4 var end = e.selectionEnd;
5 return e.value.substring(start, end);
6 }else return ""; // Not supported on this browser
7 }
