javascript - 找不到发送帖子请求的方法

在这里，您只需像这样在数组中搜索“笔画”即可：

演示

xhr = new XMLHttpRequest();
xhr.open("GET", "http://colorillo.com/blqu.inline.svg");
xhr.addEventListener("load", function() {
    const xmlDoc = new DOMParser().parseFromString(
        this.responseText.trim(),
        "image/svg+xml"
    );
    let output = [];
    // Get all polylines as strings
    let lines = xmlDoc.getElementsByTagName('polyline');
    // Loop over all lines
    for(let line of lines) {
        //Define more vars here...
        //Often times you can just use something like below and don't need to put it in the loop.
        let stroke = null; //See Bruce'es comment (rgb() as output): line.style.stroke;
        let opacity = line.style.opacity;
        let strokeWidth = line.style.strokeWidth;

        // Loop over all styles of this line (output same as input [hex])
        for(let style of line.getAttribute('style').split(';')) {
            // Get name & value
            let valueOffset = style.indexOf(':');
            // Check if name equal to 'stroke'
            let value = style.substr(valueOffset + 1).trim()
            switch(style.substr(0, valueOffset).trim()) {
                case 'stroke':
                    // Save stroke value
                    stroke = value;
                    // Break out of the loop (we don't have to search further)
                    break;
            }
        }
        output.push({
            l: (JSON.stringify(line.getAttribute('points').split(' ').map(pair => pair.split(',').map(Number)))),
            w: (strokeWidth),
            c: (stroke),
            o: (opacity),
            f: ("1"),
            _: ("false")
        });
    }
    $.post("/draw.php?ing=_index", output);
});
xhr.send();

希望这可以帮助。-思想