我如何找到我的数组的长度 [英] how can i find the length of my array

问题描述

toencode: function ()
{
var xml = '';
var i = 1;
for (var p in this.pl)
{

xml += p + '=' + this.pl[p];
if(i < this.pl.length)
{
xml += '&';
}
i++;
}

return xml;
}

当我的调试器此时位于this.pl.length时，它表明长度是不确定的.
但我在pl中有3个参数.
并且如果条件将不执行.
有人可以帮我吗?

when my debugger come at this.pl.length at this point it shows that length is undefined.
but i have 3 parameter in pl.
and if condition is not going to execute.
can anyone help out me?

推荐答案

使用length 属性.

示例(取自 http://www.w3schools.com/jsref/jsref_length_array.asp [ ^ ])

Use the length property.

Example (taken from http://www.w3schools.com/jsref/jsref_length_array.asp[^])

<script type="text/javascript">

var fruits = ["Banana", "Orange", "Apple", "Mango"];
 document.write("Original length: " + fruits.length);
 document.write("<br />");
 fruits.length=5;
 document.write("New length: " + fruits.length);
</script>

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