web前端|js教程
数组,重复值
web前端-js教程
js数组中去除重复值
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Array.prototype.del = function() { var a = {}, c = [], l = this.length; for (var i = 0; i < l; i++) { var b = this[i]; var d = (typeof b) + b; if (a[d] === undefined) { c.push(b); a[d] = 1; } } return c; } alert([1, 1, 2, 3, 4, 5, 4, 3, 4, 4, 5, 5, 6, 7].del());
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]方法二
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//去重复数组
function unique(data){
data = data || [];
var a = {};
len = data.length;
for (var i=0; i<len;i++){
var v = data[i];
if (typeof(a[v]) == undefined){
a[v] = 1;
}
};
data.length=0;
for (var i in a){
data[data.length] = i;
}
return data;
}
方法三
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var arr = ["123","123","123","123","sfsdf","123","345","123","123","345","456","567","sdc"];
var str = [];
for(var i = 0,len = arr.length;i < len;i++){
! RegExp(arr[i],"g").test(str.join(",")) && (str.push(arr[i]));
}
alert(str);
方法四
var pureMulti1=function(arr){
var obj={};
var a = [];
for(var i=0,l=arr.length;iif(!((arr[i]+"") in obj)){
a.push(arr[i]);
}
obj[arr[i]]="";
}
return a;
}
