Javascrpit特效之打字机效果

2018-6-25 释然 前端技术资源

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今天来看看怎么实现炫酷的打字机效果。即把一段话一个字一个字的显示出来。

效果图:

实现思路:

首先规定好显示字数的速度即settimeout执行间隔用来控制每个字之间输出速度。再把判断段落的总字数,循环段落总字数来实现一个字一个字的输出。

js代码:


	
  1. var theNewsNum;
  2. var theAddNum;
  3. var totalNum;
  4. var CurrentPosion=0;
  5. var theCurrentNews;
  6. var theCurrentLength;
  7. var theNewsText;
  8. var theTargetLink;
  9. var theCharacterTimeout;
  10. var theNewsTimeout;
  11. var theBrowserVersion;
  12. var theWidgetOne;
  13. var theWidgetTwo;
  14. var theSpaceFiller;
  15. var theLeadString;
  16. var theNewsState;
  17. function startTicker(){
  18. // ------ 设置初始数值
  19. theCharacterTimeout = 50;//字符间隔时间
  20. theNewsTimeout = 2000;//新闻间隔时间
  21. theWidgetOne = "_";//新闻前面下标符1
  22. theWidgetTwo = "-";//新闻前面下标符
  23. theNewsState = 1;
  24. theNewsNum = document.getElementById("incoming").children.AllNews.children.length;//新闻总条数
  25. theAddNum = document.getElementById("incoming").children.AddNews.children.length;//补充条数
  26. totalNum =theNewsNum+theAddNum;
  27. theCurrentNews = 0;
  28. theCurrentLength = 0;
  29. theLeadString = " ";
  30. theSpaceFiller = " ";
  31. runTheTicker();
  32. }
  33. // --- 基础函数
  34. function runTheTicker(){
  35. if(theNewsState == 1){
  36. if(CurrentPosion<theNewsNum){
  37. setupNextNews();
  38. }
  39. else{
  40. setupAddNews();
  41. }
  42. CurrentPosion++;
  43. if(CurrentPosion>=totalNum||CurrentPosion>=1){
  44. CurrentPosion=0;//最多条数不超过num_gun条
  45. }
  46. }
  47. if(theCurrentLength != theNewsText.length){
  48. drawNews();
  49. }
  50. else{
  51. closeOutNews();
  52. }
  53. }
  54. // --- 跳转下一条新闻
  55. function setupNextNews(){
  56. theNewsState = 0;
  57. theCurrentNews = theCurrentNews % theNewsNum;
  58. theNewsText = document.getElementById("AllNews").children[theCurrentNews].children.Summary.innerText;
  59. theTargetLink = document.getElementById("AllNews").children[theCurrentNews].children.Summary.children[0].href;
  60. theCurrentLength = 0;
  61. document.all.hottext.href = theTargetLink;
  62. theCurrentNews++;
  63. }
  64. function setupAddNews() {
  65. theNewsState = 0;
  66. theCurrentNews = theCurrentNews % theAddNum;
  67. theNewsText = document.getElementById("AllNews").children[theCurrentNews].children.Summary.innerText;
  68. theTargetLink = document.getElementById("AllNews").children[theCurrentNews].children.Summary.children[0].href;
  69. theCurrentLength = 0;
  70. document.all.hottext.href = theTargetLink;
  71. theCurrentNews++;
  72. }
  73. // --- 滚动新闻
  74. function drawNews(){
  75. var myWidget;
  76. if((theCurrentLength % 2) == 1){
  77. myWidget = theWidgetOne;
  78. }
  79. else{
  80. myWidget = theWidgetTwo;
  81. }
  82. document.all.hottext.innerHTML = theLeadString + theNewsText.substring(0,theCurrentLength) + myWidget + theSpaceFiller;
  83. theCurrentLength++;
  84. setTimeout("runTheTicker()", theCharacterTimeout);
  85. }
  86. // --- 结束新闻循环
  87. function closeOutNews(){
  88. document.all.hottext.innerHTML = theLeadString + theNewsText + theSpaceFiller;
  89. theNewsState = 1;
  90. setTimeout("runTheTicker()", theNewsTimeout);
  91. }
  92. window.onload=startTicker;
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标签: Javascrpit特效之打字机效果


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