想使对象的动态值（从用户输入），但我得到“未定义”。想法是有3个输入字段，用户应在其中输入值，以填满警报消息。
<script type="text/javascript">
function Family (fatherName, motherName, sisterName) {
this.fatherName = fatherName;
this.motherName = motherName;
this.sisterName = sisterName;
this.myFamily = function() {
alert("My father's name is " + this.fatherName +", my mother's name is "+ this.motherName +" and my sister's name is " + this.sisterName +".");
}
}
var Me = new Family(
Family["fatherName"] = father,
Family["motherName"] = mother,
Family["sisterName"] = siter);
var father = document.getElementById("fatherId").value;
var mother = document.getElementById("motherId").value;
var sister = document.getElementById("sisterId").value;
</script>
<input type="text" id="fatherId" />
<input type="text" id="motherId" />
<input type="text" id="fatherId" />
<input type="submit" value="Send" onclick="Me.myFamily();">
我也在寻找一种方法，用户可以添加或删除属性（其中的值也是如此）。
最佳答案
Here是您的示例的摘要。
<input type="text" id="fatherId" />
<input type="text" id="motherId" />
<input type="text" id="sisterId" />
<input type="submit" value="Send" id="submit" />
<script>
function Family(fatherName, motherName, sisterName) {
this.fatherName = fatherName;
this.motherName = motherName;
this.sisterName = sisterName;
this.myFamily = function() {
alert("My father's name is " + this.fatherName +
", my mother's name is " + this.motherName +
" and my sister's name is " + this.sisterName + ".");
};
}
document.getElementById("submit").onclick = function() {
var father = document.getElementById("fatherId").value;
var mother = document.getElementById("motherId").value;
var sister = document.getElementById("sisterId").value;
Me = new Family(father, mother, sister);
Me.myFamily();
}
</script>
布兰登很好地总结了所有错误。
*编辑：（回答您的评论）
您的代码有两个与执行相关的问题。
<script>标记会立即执行，因此，如果在<input>部分之前插入脚本，则没有input元素可用于检索。您想检索输入的值，但是当用户单击
submit时，这些输入包含数据，因此必须在.value()时使用onclick进行读取。如果尝试在onclick部分之外读取它们，则在页面加载期间输入字段为空时将立即访问它们。关于javascript - 对象属性中的动态值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8363725/