回答編集履歴
1
chousei
answer
CHANGED
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@@ -56,4 +56,67 @@
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56
56
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<input type="button" id="reset" value="RESET" disabled>
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57
57
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<input type="number" id="time" min="0" max="180" value="0">
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58
58
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</p>
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59
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+
```
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60
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+
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61
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+
# 分・秒の表示
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62
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```javascript
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63
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<script>
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64
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var timerId;
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65
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var defaultTime=0;
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66
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window.addEventListener('DOMContentLoaded', ()=>{
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67
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const start=document.querySelector("#start");
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68
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const stop=document.querySelector("#stop");
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69
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const reset=document.querySelector("#reset");
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70
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const min=document.querySelector("#min");
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71
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const sec=document.querySelector("#sec");
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72
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const time=document.querySelector("#time");
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73
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start.addEventListener('click',()=>{
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74
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start.disabled=true;
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75
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stop.disabled=false;
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76
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reset.disabled=true;
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77
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timerId= setInterval(countdown=()=>{
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78
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var v=parseInt(time.value);
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79
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v--;
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80
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if(v<=0){
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81
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clearInterval(timerId);
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82
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stop.disabled=true;
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83
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reset.disabled=false;
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84
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}
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85
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time.value=v;
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86
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min.textContent=parseInt(v/60);
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87
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sec.textContent=v%60;
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88
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return countdown;
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89
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},1000);
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90
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});
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91
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stop.addEventListener('click',()=>{
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92
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clearInterval(timerId);
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93
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start.disabled=false;
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94
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stop.disabled=true;
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95
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reset.disabled=false;
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96
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});
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97
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reset.addEventListener('click',()=>{
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98
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start.disabled=false;
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99
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reset.disabled=true;
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100
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time.value=defaultTime;
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101
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min.textContent=parseInt(defaultTime/60);
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102
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sec.textContent=defaultTime%60;
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103
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});
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104
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time.addEventListener('input',()=>{
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105
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min.textContent=parseInt(time.value/60);
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106
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sec.textContent=parseInt(time.value)%60;
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107
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defaultTime=parseInt(time.value);
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108
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start.disabled=parseInt(time.value)<=0;
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109
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});
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110
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});
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111
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</script>
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112
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<p>
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113
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<span id="min">0</span> 分
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114
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<span id="sec">0</span> 秒
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115
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</p>
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116
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<p>
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117
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<input type="button" id="start" value="START" disabled>
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118
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<input type="button" id="stop" value="STOP" disabled>
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119
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<input type="button" id="reset" value="RESET" disabled>
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120
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<input type="number" id="time" min="0" max="180" value="0">
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121
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</p>
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59
122
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```
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