js中判断对象数组中是否有某个属性的方法 js怎么判断某个数组里面是否包含这个元素？
js\u600e\u4e48\u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5c5e\u6027\u53ef\u4ee5\u7528\u6570\u7ec4\u7684indexOf\u51fd\u6570\uff0c\u65b9\u6cd5arr.indexOf(find,start);
find:\u8981\u627e\u7684\u5185\u5bb9\uff0c\u5fc5\u987b\uff1b
start:\u67e5\u627e\u5f00\u59cb\u4e0b\u6807\uff0c\u53ef\u9009\uff1b
\u8fd4\u56de\uff1a\u67e5\u627e\u6570\u636e\u6240\u5728\u7684\u4e0b\u6807\uff0c\u5982\u679c\u6ca1\u627e\u5230\uff0c\u8fd4\u56de-1
\u5982\u679c\u53ea\u8981\u77e5\u9053\u662f\u5426\u67098\u8fd9\u4e2a\u6570\u5b57\uff0c\u76f4\u63a5\u8c03\u7528arr.indexOf(8)\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e0d\u4e3a-1\uff0c\u8bf4\u660e\u627e\u5230\u4e86
var s=[1,2,3,5,6,9];
var u=s.indexOf(5);//\u8fd4\u56de5\u6240\u5728\u7684\u4e0b\u68073
var d=s.indexOf(8);//\u8fd4\u56de-1
console.log(u);
console.log(d);
\u5728C#\u8bed\u6cd5\u4e2d\u5224\u65ad\u96c6\u5408\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5143\u7d20\u53ef\u4ee5\u4f7f\u7528Contains\u65b9\u6cd5\uff0c\u4f46\u662f\u7c7b\u4f3c\u7684\u95ee\u9898\u5728javascript\u4e2d\u8981\u600e\u4e48\u5904\u7406\u5462\uff0cjs\u4e2d\u6ca1\u6709Contains\u65b9\u6cd5\u3002 \u6211\u4eec\u53ef\u4ee5\u5229\u7528js\u7684\u539f\u578b\u6269\u5c55\u6765\u5c01\u88c5\u4e00\u4e2a\u6211\u4eec\u81ea\u5df1\u7684Contains\u65b9\u6cd5\u3002
$(function () { Array.prototype.contains = function (element) { //\u5229\u7528Array\u7684\u539f\u578bprototype\u70b9\u51fa\u4e00\u4e2a\u6211\u60f3\u8981\u5c01\u88c5\u7684\u65b9\u6cd5\u540dcontains for (var i = 0; i
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