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<script type="text/javascript">
console.log(this === window); // true
console.log(window.alert === this.alert); // true
console.log(this.parseInt("021", 10)); // 10
</script>

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// ¶¨ÒåÒ»¸öÈ«¾Öº¯Êý
function foo() {
console.log(this.fruit);
}
// ¶¨ÒåÒ»¸öÈ«¾Ö±äÁ¿£¬µÈ¼ÛÓÚwindow.fruit = "apple";
var fruit = "apple";
// ´Ëʱº¯ÊýfooÖÐthisÖ¸Ïòwindow¶ÔÏó
// ÕâÖÖµ÷Ó÷½Ê½ºÍwindow.foo();ÊÇÍêÈ«µÈ¼ÛµÄ
foo(); // "apple"
// ×Ô¶¨ÒåÒ»¸ö¶ÔÏ󣬲¢½«´Ë¶ÔÏóµÄÊôÐÔfooÖ¸ÏòÈ«¾Öº¯Êýfoo
var pack = {
fruit: "orange",
foo: foo
};
// ´Ëʱº¯ÊýfooÖÐthisÖ¸Ïòwindow.pack¶ÔÏó
pack.foo(); // "orange"

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// ¶¨ÒåÒ»¸öÈ«¾Öº¯Êý
function foo() {
console.log(this.fruit);
}

// ¶¨ÒåÒ»¸öÈ«¾Ö±äÁ¿
var fruit = "apple";
// ×Ô¶¨ÒåÒ»¸ö¶ÔÏó
var pack = {
fruit: "orange"
};

// µÈ¼ÛÓÚwindow.foo();
foo.apply(window); // "apple"
// ´ËʱfooÖеÄthis === pack
foo.apply(pack); // "orange"

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function foo() {
if (this === window) {
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}


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