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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>
<script >
function lookUp(dataObj, keyname) {
// keyname中包含.符号并且本身不等于.符号,才进入这个判断，
if (keyname.indexOf('.') != -1 && keyname != '.') {
// 将a.b.c拆分成一个数组
var names = keyname.split('.')
var temp = dataObj
for (let i = 0; i < names.length; i++) {
//第一次data.a 第二次data.a.b 第三次 data.a.b.c
console.log(temp[names[i]]);
// console.log(temp );
// console.log(names[i] );
temp = temp[names[i]]
}
return temp
}
//不包含.符号或者本身等于.符号直接返回 data,keynane
return dataObj[keyname]
}
let data = {
a: {
b:{
c:100
}
}
}
lookUp(data,'a.b.c')
</script>
</body>
</html>