JavaScript\u306e\u95a2\u6570\u306e\u4e2d\u3067\u5ba3\u8a00\u3059\u308b\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u306b\u3064\u3044\u3066\u7406\u89e3\u3092\u6df1\u3081\u307e\u3057\u3087\u3046\u3002
\n<\/p>\n
\u57fa\u672c\u306f\u3001var\u3092\u4f7f\u3063\u3066\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\uff08\u6b63\u78ba\u306b\u306fwindow\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\uff09\u3068\u3001\u95a2\u6570\u5185\u306e\u5909\u6570\uff08\u6b63\u78ba\u306b\u306f\u95a2\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\uff09\u304c\u78ba\u5b9f\u306b\u5225\u3005\u306e\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\r\n<!DOCTYPE html>\r\n<html>\r\n<head>\r\n <meta http-equiv="content-type" content="text\/html; charset=UTF-8">\r\n <title>setInterval sample 1<\/title>\r\n<\/head>\r\n<body>\r\n <div id="log" style="position:absolute;"><\/div><br \/>\r\n<script>\r\nvar t = 'a:' + a + '<br \/>';\r\nt = t + 'f0():' + f0() + '<br \/>';\r\nvar a = '\u30b0\u30ed\u30fc\u30d0\u30eb a';\r\nfunction f0() {\r\n var a = '\u30ed\u30fc\u30ab\u30eb a';\r\n return a;\r\n}\r\n\r\n\/\/ var\u3092\u7701\u7565\r\nb = '\u30b0\u30ed\u30fc\u30d0\u30eb b';\r\nt = t + 'b:' + b + '<br \/>';\r\n\r\nfunction f1() {\r\n b = '\u30ed\u30fc\u30ab\u30eb b'; \/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u304c\u4f7f\u308f\u308c\u308b\r\n return b;\r\n}\r\nt = t + 'f1():' + f1() + '<br \/>';\r\n\/\/ b \u304c\u4e0a\u66f8\u304d\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u308b\r\nt = t + 'b:' + b + '<br \/>';\r\n\r\nvar c = '\u30b0\u30ed\u30fc\u30d0\u30eb c';\r\nt = t + 'c:' + c + '<br \/>';\r\nfunction f2() {\r\n alert('f2_c 1:' + c); \/\/ \u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306ec\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u306e\u3067undefined\r\n var c = '\u30ed\u30fc\u30ab\u30eb c';\r\n alert('f2_c 2:' + c); \/\/ \u3053\u3053\u3067\u306f\u521d\u671f\u5316\u3055\u308c\u3066\u3044\u308b\u306e\u3067 \u30ed\u30fc\u30ab\u30eb c\r\n return c;\r\n}\r\nt = t + 'f2():' + f2() + '<br \/>'; \/\/ \u30ed\u30fc\u30ab\u30eb c\r\n\r\n\/\/ \u30b9\u30b3\u30fc\u30d7\u30c1\u30a7\u30fc\u30f3\u306e\u78ba\u8a8d\r\n\/\/ \u4e00\u756a\u8fd1\u3044\u5909\u6570\u304c\u4f7f\u308f\u308c\u308b\u3053\u3068\u304c\u308f\u304b\u308b\r\nvar d = '\u30b0\u30ed\u30fc\u30d0\u30eb d';\r\nfunction f3() {\r\n var d = '\u30ed\u30fc\u30ab\u30eb d';\r\n function _f3() {\r\n var a = '_f3 \u30ed\u30fc\u30ab\u30eb a';\r\n alert('a,d:' + a + ',' + d);\r\n }\r\n _f3();\r\n}\r\nf3();\r\n\r\ndocument.getElementById('log').innerHTML = t;\r\n<\/script>\r\n<\/body>\r\n<\/html>\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308b\u3002alert\u95a2\u6570\u306b\u3088\u308b\u8868\u793a\u306b\u3064\u3044\u3066\u306f\u7701\u7565\u3057\u3066\u3044\u308b\u3002<\/p>\n
\r\na:undefined\r\nf0():\u30ed\u30fc\u30ab\u30eb a\r\nb:\u30b0\u30ed\u30fc\u30d0\u30eb b\r\nf1():\u30ed\u30fc\u30ab\u30eb b\r\nb:\u30ed\u30fc\u30ab\u30eb b\r\nc:\u30b0\u30ed\u30fc\u30d0\u30eb c\r\nf2():\u30ed\u30fc\u30ab\u30eb c\r\n<\/pre>\nJavaScript\u306b\u3064\u3044\u3066\u306f\u3001\u4e0b\u8a18\u306e\u66f8\u7c4d\u306e\u53c2\u8003\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n