直接调用方法就可
console.log(this.textSize("15px", "Arial", "字符串获取宽度和高度"))
textSize(fontSize, fontFamily, text) {
var span = document.createElement("span");
var result = {};
result.width = span.offsetWidth;
result.height = span.offsetHeight;
span.style.visibility = "hidden";
span.style.fontSize = fontSize;
span.style.fontFamily = fontFamily;
span.style.display = "inline-block";
document.body.appendChild(span);
if (typeof span.textContent != "undefined") {
span.textContent = text;
} else {
span.innerText = text;
}
result.width =
parseFloat(window.getComputedStyle(span).width) - result.width;
result.height =
parseFloat(window.getComputedStyle(span).height) - result.height;
return result;
},
