JavaScript 实用方法
Posted 惊涛拍岸，风卷残云，指端似有雄兵百万
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1.按时间显示问候语
2.强制光标停留位置
3.保存页面文本
1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 2 <html><head> 3 <title>JS常用方法</title> 4 <meta name="Generator" content="EditPlus"> 5 <meta name="Author" content=""> 6 <meta name="Keywords" content=""> 7 <meta name="Description" content=""> 8 <script language="javascript"> 9 10 <!-- 另存为文件--> 11 function SaveCode(obj, filename) 12 { 13 var win = window.open(‘‘, ‘_blank‘, ‘top=100‘); 14 var code = obj.innerText; 15 code = code == null || code == "" ? obj.value : code; 16 win.opener = null; 17 win.document.write(code); 18 win.document.execCommand(‘saveas‘, true, filename); 19 win.close(); 20 } 21 <!-- 问候--> 22 window.onload = function() 23 { 24 var now = new Date(); 25 var hour = now.getHours(); 26 var greeting; 27 if (hour < 6) 28 greeting = "凌晨好"; 29 else if (hour < 10) 30 greeting = "早上好"; 31 else if (hour < 14) 32 greeting = "中午好"; 33 else if (hour < 18) 34 greeting = "下午好"; 35 else 36 greeting = "晚上好"; 37 38 document.getElementById("hi").innerHTML = "<font color=red>" + greeting + "</font>" ; 39 } 40 <!-- 将光标停在对象的最后--> 41 function PutCursorAtLast(obj) 42 { 43 obj.focus(); 44 var range = obj.createTextRange(); 45 range.moveStart(‘character‘,obj.value.length); 46 range.collapse(true); 47 range.select(); 48 } 49 <!-- 将光标停在对象的最前--> 50 function PutCursorAtFirst(obj) 51 { 52 obj.focus(); 53 var range = obj.createTextRange(); 54 range.moveStart(‘character‘,0); 55 range.collapse(true); 56 range.select(); 57 } 58 </script> 59 </head> 60 <body> 61 62 <span id="hi"></span><br /> 63 64 <span>curssor at last </span><br /> 65 <input type="text" value="curssor at last" onclick="PutCursorAtLast(this)"> 66 <br /> 67 68 <span>curssor at first </span><br /> 69 <input type="text" value="curssor at first" onclick="PutCursorAtFirst(this)"> 70 <br /> 71 72 <span>save file </span><br /> 73 <input type="text" value="hello word" onclick=‘SaveCode(this,"save")‘ /><br/> 74 75 </body> 76 </html>
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