使用JS在textarea在光标处插入内容(3)

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                var str = "[#$%$#]";
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                if (document.selection) {
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                    obj.focus();
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                    var sel = document.selection.createRange();
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                    sel.text = str;
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                } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {
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                    var startPos = obj.selectionStart;
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                    var endPos = obj.selectionEnd;
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                    var tmpStr = obj.value;
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                    obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);
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                } else {
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                    obj.value += str;
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            });
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        });

摘自 JSON