javascrpit-js中如何判断一个list中包含多少个对象 js中如何判断数组中是否含有某一项？
javascrpt \u83b7\u53d6div\u6807\u7b7ename\u7684\u5c5e\u6027\u503c1.document.getElementByName("1")\u53ef\u4ee5\u83b7\u5f97name\u4e3a1\u7684\u8fd9\u4e2adiv\uff1b2.\u5982\u679c\u4f60\u662f\u60f3\u83b7\u5f97\u8fd9\u4e2adiv\u4e2dname\u7684\u503c\u53ef\u4ee5\u7528jquery\u7684attr\u65b9\u6cd5\uff0c$("#script").attr("name");3.\u7528js\u65b9\u6cd5\u4e3adocument.getElementById("script").name \uff08\u7531\u4e8ename\u7684\u503c\u53ef\u80fd\u4e0d\u552f\u4e00\uff0c\u6240\u4ee5\u91c7\u7528\u83b7\u53d6id\u7684\u65b9\u6cd5\uff09
\u56e0\u4e3a\u4e0d\u77e5\u9053\u4f60\u8fd9\u4e2a\u95ee\u9898\u7684\u5177\u4f53\u60f3\u4e86\u89e3\u7684\u5185\u5bb9\uff0c\u6240\u4ee5\u6211\u628a\u53ef\u80fd\u7684\u60c5\u51b5\u90fd\u548c\u4f60\u8bf4\u4e86\u4e0b
\u4e00\u3001JQuery
\u5982\u679c\u662f\u7528JQuery\u7684\u8bdd\uff0c\u53ef\u4ee5\u7528inArray()\u51fd\u6570\uff1a
jquery inarray()\u51fd\u6570\u8be6\u89e3jquery.inarray(value,array)\u786e\u5b9a\u7b2c\u4e00\u4e2a\u53c2\u6570\u5728\u6570\u7ec4\u4e2d\u7684\u4f4d\u7f6e(\u5982\u679c\u6ca1\u6709\u627e\u5230\u5219\u8fd4\u56de -1 )\u3002determine the index of the first parameter in the array (-1 if not found).\u8fd4\u56de\u503cjquery\u53c2\u6570value (any) : \u7528\u4e8e\u5728\u6570\u7ec4\u4e2d\u67e5\u627e\u662f\u5426\u5b58\u5728array (array) : \u5f85\u5904\u7406\u6570\u7ec4\u3002\u7528\u6cd5\u4e3a\uff1a
$.inArray(value, array)\u4e8c\u3001\u81ea\u5df1\u5199\u51fd\u6570
function contains(arr, obj) { var i = arr.length; while (i--) { if (arr[i] === obj) { return true; } } return false; }\u7528\u6cd5\u4e3a\uff1a
var arr = new Array(1, 2, 3); contains(arr, 2);//\u8fd4\u56detrue contains(arr, 4);//\u8fd4\u56defalse\u4e09\u3001\u7ed9Array\u589e\u52a0\u4e00\u4e2a\u51fd\u6570
Array.prototype.contains = function (obj) { var i = this.length; while (i--) { if (this[i] === obj) { return true; } } return false; }\u4f7f\u7528\u65b9\u6cd5\uff1a
[1, 2, 3].contains(2); //\u8fd4\u56detrue [1, 2, 3].contains('2'); //\u8fd4\u56defalse
<script>
$(
function(){
var array ;
$("#tbody tr td").click(function(){
$("#tbody tr").removeClass("click");
$(this).find("#tbody tr").addClass("click");
});
$.post(
base_path+"/record/find.do",
{},
function(result){
if(result.success){
var list=result.data;
$(list).each(function(){
array = new Array(???);
//每次遍历会得到一个笔记本对象
var table='<tr><td style="display:none;">'+this.record_id+'</td><td>'
+this.record_title+'</td><td>'+this.record_time+'</td><td>'+this.record_man+
'</td><td>'+this.record_content+'</td><td>'+this.record_comment+'</td><td> '
+'<button class="btn btn-small" type="button" onclick="OK(this)">Change</button>'
+' <button class="btn btn-small" type="button" onclick="goChange()">Delete</button>';
$('#tbody').append(table);
$('#tbody tr td:last').data("data",this);
});
}else{
alert(result.message)
}
}
);
</script>
[#list row as product]
<div >{user}</div>
[/#list]
list.length
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绛旓細闇瑕佸噯澶囩殑鏉愭枡鍒嗗埆鏈夛細鐢佃剳銆乭tml缂栬緫鍣ㄣ佹祻瑙堝櫒銆1銆侀鍏堬紝鎵撳紑html缂栬緫鍣紝鏂板缓html鏂囦欢锛屼緥濡傦細index.html锛岀紪鍐欓棶棰樺熀纭浠ｇ爜銆2銆佸湪index.html涓殑鏍囩锛岃緭鍏js浠ｇ爜锛$('body').append($('#shuz').val());銆3銆佹祻瑙堝櫒杩愯index.html椤甸潰锛屾鏃秙huz鏁扮粍涓殑鍊艰鎴愬姛鐢╦s鍙栧嚭鎵撳嵃浜嗗嚭鏉ャ
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