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1、基本思想
假設待排序的記錄存放在數組R[1..n]中。初始時，R[1]自成1個有序區，無序區為R[2..n]。從i=2起直至i=n為止，依次將R[i]插入當前的有序區R[1..i-1]中，產生含n個記錄的有序區。
複製代碼 代碼如下:
<!doctype html>
<html>
<head><title>javascript直接插入排序</title>
<meta charset = "utf-8" />
</head>
<body>
<script>
var arr = [];
for(var i=0;i<20;++i)
{
arr.push(~~(Math.random()*20));
}
document.write(arr+"<br/>");
Array.prototype.insertionSort = function()
{
var j;
var value;
for(var i=1;i<this.length;i++)
{
j=i;
value = this[j];
while(j>0 && this[j-1]>value)
{
this[j] = this[j-1];
j--;
}
this[j] = value;
}
}
arr.insertionSort();
document.write(arr+"<br/>");
</script>
</body>
</html>
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