回答編集履歴
1
追記
test
CHANGED
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@@ -45,3 +45,47 @@
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45
45
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46
46
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47
47
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```
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48
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49
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50
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51
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追記
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52
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53
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54
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55
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オブジェクトの存在判定など。
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56
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57
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58
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59
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```lang-JavaScript
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60
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61
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62
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63
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//AudioContextの存在判定(なければfalseになり、あればそのオブジェクトが代入される)
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64
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65
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window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;
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66
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67
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//これとおなじ
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68
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69
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if(window.AudioContext) window.AudioContext = window.AudioContext;
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70
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71
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else if(window.webkitAudioContext)window.AudioContext = window.webkitAudioContext;
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72
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73
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else if(window.mozAudioContext)window.AudioContext = window.mozAudioContext;
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74
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75
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else window.AudioContext = false;
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76
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77
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78
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79
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//addEventListener なければattachEventを[on]で使えるようにする
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80
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81
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var on = ['addEventListener ', 'attachEvent'];
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82
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83
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var i = -1;
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84
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85
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window[on[++i]] || window[on[++i];
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86
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87
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on = on[i];
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88
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89
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90
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91
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```
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