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test.html
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test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div id="test" onclick="test">
father
<div id="child1">child</div>
<div id="child2">child2</div>
</div>
<script>
function isChild(father, child) {
if (father.contains(child)) {
console.log(true);
} else {
console.log(false);
}
}
console.log(document.body.querySelector('div'))
// console.log($('#child1'), $('#child2'))
isChild(document.body.querySelector('#test'), document.body.querySelector('#child2'));
var length = 10;
function fn() {
console.log(this,this.length++)
return this.length;
}
var obj1 = {
length: 5,
test1: function() {
return fn()
}
}
obj1.test2 = fn;
obj1.test1.call()
obj1.test1()
obj1.test2.call()
obj1.test2()
console.log(obj1)
console.log(window.length)
</script>
</body>
</html>