JavaScript method code for obtaining selected text_javascript skills

Copy code The code is as follows: new document body { font-size:12px; } #show { background-color:#CCFF99; } Fish died mysteriously in the river, downstream Residents are frequently suffering from strange diseases, and coastal plants are constantly mutating. Is it due to residual pesticides? Or a biochemical attack? Please pay attention to tonight's CCTV-10 "Scientific Exploration", the upcoming special program: "The Mysterious Foot Washer by the River-Chinese Men's Football Team" Get selected value String .prototype.trim = function() { return this.replace(/^s |s $/g, ""); } /* There are some problems with method 1 FF*/ function getSelectText() { try{ // IE: document.selection.createRange() W3C:window.getSelection() var selectText = (document.selection && document.selection.createRange)? document .selection.createRange().text : window.getSelection().toString(); if(selectText != null && selectText.trim() != ""){ }catch(err){} } } /* Method 2*/ function getSelectText2(id) { var t = document.getElementById(id); if( window.getSelection) { if(t.selectionStart != undefined && t.selectionEnd != undefined) { return t.value.substring(t.selectionStart, t.selectionEnd); } else { return ""; } } else { return document.selection.createRange().text; } } document.getElementById('btn') .onclick = function() { document.getElementById('show').innerHTML = getSelectText2('content'); }