[英]How to count a javascript array and get output like this?
我有這樣的數組
["5763.34", "5500.00", "5541.67", "5541.67"]
我想計算相似的值並得到像
(1 * 5763.34) + (1 * 5500.00) + (2 * 5541.67)
任何想法如何做到這一點?
計數值:
var array = ["5763.34", "5500.00", "5541.67", "5541.67"]
var counts = {};
for (var i = 0; i < array.length; ++i) {
var val = array[i];
if (val in counts) {
counts[val]++;
} else {
counts[val] = 1;
}
}
打印它們:
var strings = [];
for (var k in counts) {
strings.push('(' + counts[k] + ' * ' + k + ')');
}
alert(strings.join(' + '));
在這里嘗試: http : //jsfiddle.net/k46kL/1
像這樣做
sum = 0
for(i=0; i< array.length; i++){
sum += array[i] * (i+1)
}
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