Question

我遇到了Array.splice()功能的问题。当我将一个对象添加到数组中，然后将其拼接回来时，它会丢失所有属性。为什么呢？

// create a new object named myObj, test to see if all properties are intact
var myObj = {
    prop1: 5,
    prop2: 3,
    prop3: 9
};

for(key in myObj) {
    document.write(key + " <br>");
}

// they are, prepare a break-line
document.write("---<br>");    

// okay, so I'm adding the object to a newly created array
var myArr = new Array();
myArr.push(myObj);

// watch what happens if I splice the obj back out of the array
var mySplicedObj = myArr.splice(0, 1);

// why doesn't this work?
document.write(mySpliceObj.prop1);

// this shows that myObj has lost all its properties when spliced!
for(key in mySplicedObj) {
    document.write(key);
}

// how is this happening, and why?

Answer 1

splice()返回一个数组，您可以使用mySplicedObj[0]。

访问该对象

Array.splice（）的行为不符合预期

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