[英]using the “in” operator for two dimensional array with javascript
因此,我将以下数组定义如下:
var a = new Array();
a[1] = new Array();
a[1][0] = "Computer Science";
a[1][1] = "Computer Engineering";
a[1][2] = "Aerospace Engineering";
a[1][3] = "Engineering (Other)";
a[1][4] = "Web Development";
a[1][5] = "Computer Programming";
a[1][6] = "Android Development";
//a[2] through a[n] defined similarly
有一次,我试图测试字符串是否包含在[i]中的任何地方,例如“计算机科学”,所以我执行以下操作:
for(j=1; j<n; j++)
if("Computer Science" in a[j])
{
//DO SOMETHING
}
但是,此总是返回false,但是我已经验证a [j]实际上包含字符串(在a [j] [0]中)。 知道为什么会这样吗?
这有效:
var a = [];
a[0] = [];
a[1] = [];
a[1][0] = "Computer Science";
a[1][1] = "Computer Engineering";
a[1][2] = "Aerospace Engineering";
a[1][3] = "Engineering (Other)";
a[1][4] = "Web Development";
a[1][5] = "Computer Programming";
a[1][6] = "Android Development";
for(j=0; j<a.length; j++) {
if("Computer Science" in oc(a[j])) {
alert("test");
}
}
function oc(a)
{
var o = {};
for(var i=0;i<a.length;i++)
{
o[a[i]]='';
}
return o;
}
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