<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>day2</title>
<script>
//查找数组中有重复的数字
function same(arr1){
var resultArr=[];
var arr1_len=arr1&&arr1.length||0;
for(var i=0;i< arr1_len;i++){
if(arr1[i]===arr1[i+1]){
resultArr.push(arr1[i]);
}
}
return resultArr;
};
//删除数组中有重复的数字
function distinct(arr1){
var resultArr=[];
var arr1_len=arr1&&arr1.length||0;
for(var i=0;i< arr1_len;i++){
if (arr1[i] === arr1[i+1]) {
}else{
resultArr.push(arr1[i]);
}
}
return resultArr;
};
var a=[1,2,2,2,3,3,4];
var b=same(a);
var c=distinct(a);
document.write("原数组为:"+a+"<br/>");
document.write("这个数组自身存在重复的数字是:"+b+"<br/>");
document.write("去除了重复数字后的数组为:"+c);
function distinct3(arr1){
var resultArr=[];
var arr1_len=arr1&&arr1.length||0;
for(var i=0;i<arr1_len;i++){
if(resultArr.indexOf(arr1[i])<0){
resultArr.push(arr1[i]);
}
}
return resultArr;
};
var e=distinct3(a);
document.write("去除了重复数字后的数组为:"+e);
</script>
</head>
<body>
</body>
</html>
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JSON.stringify(JSON.parse('{'+[1,2,2,2,3,3,4].join(':').replace(/(\d|[a-zA-Z])+/g, '"$1":"",').replace(/,:/g, ',').replace(/,$/g, '')+'}')).replace(/[^\da-zA-Z,]/g, '').split(',')